Tis a slippery slope, this aerobatics thing, liberally greased with equal measures of adrenalin and pound notes.
And just to show that it doesn't have to be precise and "by the book", here's a short video I put together with the help of a couple of mates last month when there were good clouds to play with:
http://www.youtube.com/watch?v=p2bEFW3pT-8
Enjoy aerobatics. Once you start, you're spoiled for regular flying for the rest of your life!
Pitts2112