How does one improve at lineart/inking?

I haven’t arted digitally in a while for the sole reason my lineart is bad. It looks terrible. I’ve been doing it for years with different methods but they all look equally crappy. Oft why I just color my sketches, lines are just too difficult for me to manage. But how do I actually productively practice getting better at them?
 
Or, should I fold and see if i can find a dedicated lineartsman? Process was never too fun for me so if it comes out bad it’s an excruciating waste of time. (especially when it takes a week).
 
I’ve set a project for myself to finish a picture but I can’t start because I don’t know a way to line it in SAI that looks good.

Try adding varied sizes of lines and thickness. Also, make sure you add weight to your lines by making the thickest part point towards the source of gravity.
 
Also, coloured lines or no outlines don’t hurt at all.

I highly recommend you to try out some line smoothing software. I don’t want my post to come off as an advertisement, but there’s an app called Lazy Nezumi that works with every graphics software out there (through pairing). It is paid, but there’s a free 30-day trial so you can see if it works for you.
 
I have been struggling with poor hand-eye coordination while using a Wacom tablet until I began using that tool. Even now, after a few years of practice, my lines are terribly shaky without the smoothing.
 
You can also develop you hand through traditional art practice (and you should), but there’s still going to be a disconnection from the drawing (unless you’re using a Cintiq) while working digitally.

If lines don’t come naturally, why not consider a painterly approach? Failing that, um, practice.
 
Make a fairly simple sketch and ink it multiple times with different techniques. Some people also take to different mediums - all of the fast inkers I’ve seen either use a watercolor brush or have practiced to the point where they’re fast and accurate with a tablet.
 
You get better with better practice.

Are the lines themselves the problem?, if so try doing some still life blind contour drawing, it’ll improve your eye too.

For me; quick strokes or steady but fast strokes helps a lot to make sure the lines don’t look like crap. Utilizing the transformation tool is quite good as well unless you prefer trying to draw the same line 50 times over. Sure, it’ll artifact the lines a bit, but if you draw on a big enough canvas; it doesn’t really matter once you lower the resolution.
 
If the stabilizer in Sai is not enough; then dedicated training with lineart (preferably irl) should help. Or you can go a smarter route and don’t concentrate on lineart and make the coloring/shading aspect compensate for the lack of good lineart.

Stablizers are a bit of a crutch in a lot of ways, and they can hinder learning good techniques.  
You can find loads of good tips out there if you search for “line art practice” or whatever, but there’s some basic & useful ones:
 
Warm up before you start inking. Make two dots, then draw a straight line between them. Do that for a while, and try drawing parallel lines next to them.  
Draw three dots and try to join them with an arc.  
Draw circles (check them against a template afterwards if you can’t judge a circle by eye). Make circles into spheres with contour lines. Make cylinders.
 
A decent size tablet is really important, so you can use your arm instead of your wrist. I went with a cheap 6x10” instead of a 3x4.5” wacom, and it made a huge difference.  
Looking at your pics, long, clean strokes instead of short hatching is the single biggest thing to make them look awesomer.

@Eggonaught
 
Wow good advice. I’ll have to try that sometime. My tablet is a “medium” on Wacom standards, i can get decent arm usage out of it, nothing grand but it works.
 
And which pics? lol.I only have two on this site XP (neither of which inked how I usually do.
 
But fuck it here’s some specific examples of how I done it before that might make things more concise.
 
http://www.furaffinity.net/view/16876629/
 
That was my last successful lined picture. Old at this point but it’s still my method. Ink tool in SAI. It’s not that bad but take away the lighting and the lines look rather awkward by themselves, and I had trouble truly varying the widths as how I needed. In fact I think that’s one of my biggest issues is using width well and knowing how far to push it.