Uh, so I've been planning on starting a webcomic for quite some time now. Right now I just need to address some minor plotholes towards the middle of the story, revamp a few character designs, and.... do something about lineart. It is very hard for me to make a clean image. In traditional art, I can get away with it, but digital art is unforgiving. However, I would likely use digital media for the comic, as I don't have access to a decent scanner and want to use consistent dimensions. I am not tech-savvy enough nor do I have the equipment to digitally clean up and resize a traditional image. Currently, I use Photoshop as a kind of all-purpose art program, though it doesn't do a lot of the things Paint Tool SAI seems to. I use a Mac, so I've never had access to SAI. Digital linearting takes a lot of time and effort for me. Currently, I tried to make pages on a weekly basis, it would probably take a major toll on my other activities. I probably wouldn't be able to do it.

Can anyone give me some advice?

The above person mentioned that stabilizer feature, but you said you don't have access to sai, so i was wondering if you'd ever looked into lazy nezumi? it's a stabilizer, which means it basically smoothes/slows your strokes, so small movements are pillowed and wont muck up your lineart. there is a free trial for lazy nezumi, so you can see if it works for you before spending $35 on it. http://lazynezumi.com/

BUT! there is a way to run sai on mac, which is what some of my friends do. here is a tutorial on how to do it! :>

you can also try to zoom in a ton and work in very high res, because when you resize/zoom out it makes the mistakes less noticeable, which is sort of a good idea anyway.

another thing i might try suggesting is maybe learning a style that works with motor control issues? when i was using a mouse and didnt have a stabilizer my lineart was very shaky, so i just sort of went with it. now that i have the right tools i just turn the stabilizer on way up if im having shakes or spasms or anything (these are caused by anxiety and aren't exactly an impairment or anything). this is one of my old pieces when i was just working with what i had.

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i'll try to think up more advice and resources, too!

I don't have motor control issues, but I do most of my lineart with vector curve/line tools in both Photoshop and SAI. I find it much easier and it produces much smoother looking results, which is great for coloring. I can also ink faster this way, as it's much easier to edit complex shapes and small details just by dragging around the points to where i need them to be than trying to hand-draw it.

I haven't used it in years, but iirc Inkscape also gives you these options.

Here's an example. All of the lineart was done with the curve tool, except for the cracks on the pauldron and the folds of the ear.

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Hi! I've got some poor fine motor control issues, too!

You've already got some pretty good suggestions for programs and stabiliser options should you end up wanting to use them, but I wanted to chime in a bit anyway.

I definitely agree with what mentioned: especially about going with a style that "works" with the issue instead of trying to avoid it. They suggested two really good points related to this that I sort of do, myself.

Firstly, I imagine that vector tools in these programs would be of great help; I don't use this directly, since I don't really have access to these specific options, but I think that I still ultimately use a similar method!

Because I use a mouse and Window's MSPaint, I mostly combine freehand gestured lines for sketching, and then the line tool, curve tool, and the various pre-made shapes available for lining quickly. (I'm not sure what the mac equivalent is for MSPaint but I assume there's one.)

Secondly, working in large sizes/dpi and zooming in and out regularly is also good advice--in for cleaning up lines easier, out for making sure that proportions and the like don't look wonky. It also means that wobbly lines can end up less noticeable since when you resize later it sort of smooths all that out.

I've included some examples below of what the results of my method/style are, but if you like, I can share some progress screenshots that display the specifics/the processes involved (like all my horrible, horrible jagged lines no one ever sees in the final resize, lol).

examples

(full size here)
more examples here