I found this article, with different approaches of which editing step may work for you :') I hope it works out! :'D
How to Make Comic Book Panels in Photoshop
I tried finding the tutorial that helped me, but it looks like it may have been deleted off dA or something since I can't find it D: But it makes the paneling process easy in 4 steps.
Oh yes! Manga Studio is nice, it comes with a lotta cool features like screentoning, pen tools, storyboarding, and all that fun stuff :') You can even choose to color, lineart, basically create your whole comic in MS if you want :') There are a couple versions, but the more basic one costs around $45.00 give or take. Even for that price, it still has a lot of things to offer. And they've been known to give out some free things when you buy it, like when I bought mine in 2011 they gave me several different backgrounds.