Learn on something thick, like a double barrel rail or flat rail at least 2' wide. It would help to learn on something like a foot off the ground. When you do something like 2' off the ground it forces you to do more work, I dont know how to explain it but its just harder. With rails like a foot high (with a little snow kicker up to it obviously) all you have to do is turn 90 degrees, less work, harder to screw up.
'Computer games don't affect kids; I mean if Pac-Man affected us as kids, we'd all be running around in darkened rooms, munching magic pills and listening to repetitive electronic music.' -Kristian Wilson, Nintendo, Inc, 1989