Going Too Fast - if you go too fast up the ramp, there's a great chance you will wipe out pretty bad. So, take it easy. Learn this trick slowly, and take your time. Also, wear a helmet! In fact, you should probably wear pads, too. Don't feel stupid - you'll be able to walk when you're 35!
Kissing the Coping - there's a good chance that if you don't go too fast and fly off the edge, you'll instead just barely touch the coping / edge with your trucks. If this happens, quickly finish the kickturn and ride down. Keep practicing. Try leaning back a little more at the top (but not too much!), and get a little more speed (but not too much!). Another common axle stall problem is where you have a hard time kickturning on and off of the coping. Like everything, this just takes practice. If you don't have your kickturns dialed in, then take a little time to practice those.
Now just get out and practice! Like I said, try on smaller ramps first. If you have a skatepark nearby (especially indoor ones), sometimes they will have small ramps facing each other. Riding back and forth between these, kickturning off each one, can be a great way to work your way up to axle stalls. Of course, if all you have is a small mini ramp in front of your house, this will work great too! Just relax, take your time, and work your way up.
Have fun!
