Well, I just started with it yesterday and finding the balance point is quite a challenge. I feel that I have to use my core much more to get me into position and still I'm using a wall to help me since I overbalance a lot.
My real question is what to do while I can't hold the position unassisted for more than a few seconds? How people worked this one up? Is there any complementary exercises I can do? Should I try to balance with my legs bent first, build up some time and then straighten them?