Any mid-air trick is tough. This is no different. Crossover and tap with the other leg.
If I had to choose ONE thing that will help you be successful with this trick, it’s this:
MAKE SURE YOUR BODY IS MOVING IN AN UPWARD DIRECTION WHEN YOU TAP.
My biggest mistake was lack of upward momentum. If you don’t have it, the ball will just drop after the tap and you will not be able to continue juggling.
Do ANYTHING you can to emphasize the tap. Believe me, it’s hard to get a hard tap on the ball when you’re in midair. There’s nothing to push off from. In the video, you’ll see both Laurent and Genier curving their body to get an extra push on the tap. That’s what it will take.
Don’t lose hope on this one. It takes many repetitions to get comfortable with it. Be patient.
Youtube Link: http://www.youtube.com/watch?v=QXhMSLagQmw