I'm having trouble performing the double and triple swipe stunts!

Typically it works best if you make the swipes in separate motions.  So, for the handstand, swipe thumbs down from the top to the bottom, and then lift your thumbs, and then swipe thumbs from the bottom up to the top.  

You have about 1/2 second for each swipe, so you have to do them quickly but not SUPER quickly.