Argh forum wasn't letting me post, wrote this up once and it got deleted. Maybe this time...
I'm working on the same, as far as I can tell:
Place the string around the outside of the top
Drop your right hand slightly, start moving left, then continue in a circle to put a loop of string around the tip. Try not to pull the tip with your palm
Slide down the string, feeding out the string with your left hand. The top should end outside the left
Circle around, pulling the top around towards the tip to stand it up
Let it go outside again on the right, as it circles back in the middle pop it up
Catch to hand or loop the string around the tip and go again
Getting a loop around the tip quickly is important. It maybe better to start with a lasso from hand just to get more practice at the movement.