My line work is still kind of sketchy & wobbly overall- but I can at least sustain a decent enough stroke to make figures. The more you push yourself to draw/ink with your tablet, you'll become better.
I use the curve ruler quite a lot to over come this problem
tip: sticky out your little finger while drawing you can use it as a guide to keep your lines straight, this take a little practice too.
I use Lazy Nezumi8 to keep my lines from getting wobbly and weird, but they get like that because wacom tablets and Photoshop don't like to play nice.
Regarding tiny sketchy lines, you just need to keep practicing to build up line confidence. I find it easier to improve if you draw on a large sketchpad where you can make broader strokes. Try drawing in ink, too, so you're forced to be more intentional with your stroke decisions. I also recommend drawing more from the elbow, as drawing with the wrist often makes for shakier lines.
Practise. Lots and lots of practise.
Smoothness in lineart has a lot to do with confidence, which means putting in the practise will help! Getting used to the intuous will help too, but mostly it's putting in the practise to the point where you learn to stop worrying so much. Just open a new blank canvas and practise drawing lines with whatever tool you use for inking - and try to do longer lines! Breaking a habit is hard, so you have to put some conscious effort into it.
Also, it helps to move your whole arm when you draw, instead of just your wrist. When you're drawing a long arcing line, try to move your entire forearm from your elbow on down, instead of just moving your wrist. It will help keep the line steady, and will also put less strain on your wrist.
first of all - and this sounds silly - try breathing exercises and stretches before you draw. make your body relaxed and loose to prevent shaking.
also, try drawing with your whole arm, not just your wrist - lift your arm from the table/paper/whatever and move your whole arm
zoom in or out and see how it effects your line
a typography trick that could help is to pull curved lines, and push straights.
aaaand thats all i got
Some drawing software has sliders for making your lines smoother. This is a screenshot form ClipStudio. The higher you set it the smoother your lines will get, but the less control you'll have over them. If you have your stabilization really high and wanted a certain curve in your line it will get straightened out.
My thoughts on tablets: I borrowed a cintique (screen to draw on) and it really did make it easier for me to draw lines. But then again I know a lot of people who are just fine with a normal tablet without a built-in screen. My line quality is so aweful that I stopped outlining all together XD Now I use only a lasso tool for everything but still remain a feeling of outlines. Some peoplehave an easier time with outlines and others with shapes. As soon as I realized I'm good at seeing shapes not lines I switched to the lasso tool and started blocking in my shapes and carving out shapes, leaving me with what my style is right now.
It really changed my life!
I use a freeware drawing program for lines and bump up a stabilizer to max because I have to deal with the fact I can never get good line quality just like I can never write words without them looking like a chicken pooped them out haha...
I keep my stabilizer on 5 coz anything more than that, and I'm fighting against the stabilizer when drawing curvy lines. 5 allows me to get some solid lines, and still be able to get the curves I that I need.
You can do the same thing in digital. I advise against using a stabilizer. Also, try zooming in, it allows you to use more of your arm to ink.
@joannekwan Yup ^ö^ It's just way easier for me that way.
I heard about the two types of artists in a dreamworks interview about the art department. There they strictly classiefied their artists as "the line artsts" and "the painters". And they said, some artists have a better feeiling for shapes than lines, usually the painters, though you can be good at both of course. Since then I found numerous artists admitting they struggle with outlines and although they could've tried honing their skills, it was so mucheasier to them working with shapes that they abandoned traditional outlines. If you know the video game Metal Gear Solid's artists Yoji Shinkawa2, well he said something similiar in an interview. He said as soon as he took a brush in his hand it felt like a natural extension to his body. With pens it felt like scratching. So he listened to his instincts and stopped working with pens and what is typically percieved as outlines. But he still does have lines and a line quality right?
I just want to mention the possibility of exploring the full scope of possibilities here! Try out different tools and mediums. Find out who you are and embrace your unique talents ♥ It might take a while but it's easier when you don't work against your natural abilities.
paint tool sai is great even if you're just importing it for lineart alone. it's really smooth and has a stabilizer so if you can't fix anything with your current program try sai.
Same advice as other commenters. Sai has a great stabilizer and there are versions you can download free. I've always gotten great lines in comparison to programs like photoshop.
I agree, as with everything, tons of practice, but to add something Im just gonna paraphrase master Asano Inio and master Marko Djurdjevic on this one, embrace your shakiness, your line art mistakes, those little bumps and interruptions of your strokes (lines), those little things are what make lines organic and realistic, sadly digital lines can turn out a little inorganic and generic.
Everyone can make a perfect line using digital tools, such as stabilizers, rulers, vectors, ect... those shakes and bumps on your lines are you as an artist, basically only you can make 'em, so embracing a little of them makes the diference.
Oo.oO
Wow! Thanks for sharing that! I honestly always feel like doing linework has always been difficult, but just working and sculpting out a painted shape comes more naturally to me.
Also, do you have any video breakdowns of your work? XD I'm curious how you achieve that awesomely unique woodcut style.
Happy to hear I'm not the only one here ^ö^ I was actually determined to push myself and draw RAVEN KING in thin lines, but not only did it take forever, it was no fun and in the end the characters didn't meet my expectations. Here's a panel (you probably recognize it from the webcomic 
) with Yoni in thin lines:
To be honest I think a lot more people would like to see the comic in this style and it was hard for me to admit I'm, well, not good enough to pull it through. This kind of panel would take me 8-12h (for one goddamn panel!!!!) With my current style this would take ca. 1h!
I could've forced myself and trained for years to get a good line quality down but the time efficiency is just too tempting XD It's so much more natural to me to be messy (>_>)"
Unfortunatelly I don't have a video breakdown of my process right now :/ It's not as easy as it might look and I did all kinds of studies beforehand (like the ones I mention further down this paragraph). There are a lot of things you have to consider with my style, that you wouldn't have to in a clean lines style. It has more freedom but that freedom leaves you with a lot more choices (more choices = more wrong choices available). Someday I'll make an in-depth video about it. Right now a video would take up too much time ^^"
But as a general tip, if you're a shapes person, start focussing on how bodyparts form rhythms and shapes. Focus on how the outlines can be interconnected to each other (look at the right arm in the gif below). Start seeing everything in big masses including the negative space, which you can later on cut out (that's a big part of my style!)
Also try using training techniques that focus on shapes only: like cutouts or using ink blobs starting with the whole shape first (you actually DO look at the outlines ONLY first, contrary to what you would normally do when constructing the human figure).
The ink blob technique really helped me by the way! You can pick any movie you want, pause frames and pick parts to render with ink. In the image above I layed in the lighter tone first and only then did I add the features.
I hope this helps you! I'm sorry I can't offer you more right now ^^" Just pick up a brush and start blobbing! See if it's more fun than pencils 
Just experiment!
PS: Gottfried Bammes has some very good shape seeing exercises in hie books on anatomy! The cutout ↑ is one of them. If you can get your hands on one of his books, that'll be money well spent.
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