The way I draw my horizontal lines is by bring my hand onto my center chest and move sideways. I was wondering if you guys know any better ways as this annoys me after awhile, but it seems its the only way for me to draw decent horizontal lines.

Not sure what you're talking about but to be steady draw with your arm and not your wrist. But maybe you can turn the paper sideways to help out with that. I wouldn't though XD.

I'd go with what Alien said. I find myself usually flipping the paper around and shi7, but when it comes to tablet drawing I just rotate the tablet a little bit.

Sometimes use other hand to hold the paper.
Draw slower with shorter strokes.
Or do a fast, long line.

I move the paper, not my hand!

Yeah, if there's a line you can't draw, just rotate the paper and try again. :)

this is really interesting, I'll try it since I always use my wrist !!!