I agree...practice, practice, practice.
You might also think about changing the size of your stitch depending on what size stippling you are doing. I found that when you are doing small tiny stippling...you need to make much smaller stitches or they will look kind of jerky.
The best thing is to doodle with your pencil every chance you get...it trains your eyes and hands....also...think..."big head, little neck"...for some reason that helps too.. :roll: