nice to see people are trying out this trick, the best tips to this trick other than just practice is
try to start fast with a lot of carve going, if u done it right at one point the bike will start going backward, than bend ur leg a bit and realse it to bring it forward again.
if u cant get it right, try it with a scuff to bring the bike going backward it will help, thats how i learnt it.
after u can do like 2 and got it dailed it is all about feeling the motion of backward and forward and maintaining that motion.
those one handed one that i do i actually learnt them by accidents started working on it and it just came, but the most i can do is only 2