3-9 is crap if you're muscles for you back leg aren't used to pushing back, not only leg strength but also just balancing while doing that. thats why i think 2-8 oclock is a better position for starting out since your leg is more fully extended in the back which gives you more leverage to push back.
whats fun is learning to do it, then trying it switch. it's like "maaaaaan i know how im supposed to do it but i cant *cry*"
remember though, after you get it you realize, it's all in the ankles!