1. know exactly what you want to do (handdrag 3, 1, etc)2. get AS MUCH speed as possible (you can always slow down)3. jump up and get horizontal (think lincoln loop)4. drag hand...5. push off your hand to get back "on axis"6. afterbang7. claim
but, you really just want to commit fully, it's a really easy, yet fun trick. i'm sure you can stomp it first try
and, if you're not into that stuff, disregard #6 and #7. haha