It really matters where you put your Tablet. I didn't know, and I spent a week and a half doing really crappy lineart before I figured it out.
Bad: Your lap, soft surfaces.
A drawing made on a bad surface. (With my wacom in my lap, sitting in bed.)
I struggled with every line for a minute or two.
Good: Hard and steady surfaces.
The same drawing with most lines redrawn on a good surface. (Still sitting in bed, but with the wacom placed on a really big, thick and heavy book.)
I erased and redid most of the lines within two minutes or less.
Thanks for reading.