If you can roll for a little bit with your right hand holding the left peg in underhand grip, then you're set to Dump!! (??) I find that from that balance point, keep your body in that exact position, and pull the bike back AND to the right, so you can just step your right foot past the frame and onto the tyre. I found at first I would always fall off the left side, coz I didn't pull the bike to the right, I was more trying to 'go around' the frame with my body. Also, if u bail forward most of the time, you're moving your body forward, not the bike back.
Watch 'Ground Rules' closely and you'll see Matt's body is basically stationary untill his foot hits the tyre.
Good luck, my man!!
(Check Flat-Paul's vid out when he gets one up for ya. He's definately got skillz)