i can do one standing on flat ground. but i was also a national gymnast. but regardless. the same principles apply.
you want to make sure you dont under rotate and you dont over rotate. the best way to assess this is to 'set' before you rotate. meaning you kind of almost jump straight up before you huck back.
once you set you will be able to feel how much you should be hucking and tucking and so on.
so when u begin, bend your kneeds, keep your arms down, then jump straight up lifting your arms, pushing back a little and tucking in a bit.
the more u tuck the more rotation you will get.