The pointing thumb helps a lot and going in circles instead of a straight line.
true. Keep your thumb extended and use it as leverage on the bars.
pay attention to the heatube angle. Just like the hang 5, the bars need to be pretty far forwards to keep it going. When your in the middle of it notice your hand holding the seat and the height of the seat in relation to the body. It helps to hold it solid in that spot. If you aren't kinda semi pulling up on the seat, holding it there, making it easier to push the bars down, it gets harder to control.
As for your leg, it will come with practice. See what happens when you kind of kick it up and out backwards behind you.
try stepping into it and then try pulling around into it from a regular steam.