Yeah practice is a big part of it, but I do have a few rules I like to follow while inking. Generally, I try to use a thicker line when drawing things/characters that are closer up, while thinner lines and less detail for things that are farther back in space.
It can take a while to get used to pressure sensitivity but you can also adjust the settings in your tablet control panel under "tip feel" so that you can have more control over how hard you have to push to get a thick vs thin line. Experiment with different settings until you find one that feels more comfortable to you. You can also play with how thick/thin you want your brush to get in brush settings if you're using a program like photoshop. The "brush tip shape" settings allows you to tell the computer how thick you want it to be when you press the most and how thin when you press the least. If you're having trouble with a very wide range, you can create a brush that has pressure sensitivity but doesn't go super thick or super thin on you while your working.