Serious question...
Can you learn to have a steady hand so you can draw? Or is it something that if you don't have it, you don't have it?
Like when I attempt to draw, I can't draw a good circle for the life of me. I cant draw a straight line either. Am I doomed to never being able to do so?
Hrm... Perhaps, but let me tell you a secret. I wouldn't be able to draw a straight line if two rulers were super glued to the paper. So, I cheat.
A trick I learned when watching my brother one day was to make repeating short light strokes in the general area of where you want to put the line. I then erase the messy lines that go far out of the way and then using my pencil I darken where I decided where the line was, using a back and fourth motion. And the last touch would be to care fully erase around the darkened line so the it looks clean.
This way takes a while but once I started drawing like this, my art greatly improved.
I hope it will work for you.