Things I Wish I Knew When I Started Drawing
Rotate your canvas or page for maximum comfort if you have to make a perfect curve. Do it for the love of god! I used to expect my hand to be able to draw any sort of line or curve perfectly from any angle, and it usually never worked out very well, but I just kept a blind belief that I needed more practice for it to work.
Your arm is physically designed to flow smoothly in certain motions, and not so smoothly in others (it'll hitch). So instead of trying to force a long smooth movement into your arm going in a unfamiliar direction, just rotate the damn page.
I came to this realization when I started reading stories about how famous inkers would go batshit crazy if they couldn't physically rotate the page they were working on.