Keep practicing riding up, endoing and then let go of the front brake. As you start you'll be quite scared so you wont endo enough and the wheel will roll forwards. The higher up you go, the bike will start to go out underneath you. GRAB YOUR FRONT BRAKE! You've got to keep doing this until you get more confident about braking lightly with the front brake to get a nice movement downwards Also, ask Danny Holroyd for more tips