Tim,
This might help, I'm not saying it's right or the best way, but once you get past the crap you can se how I do it...
http://www.smokingtailpipes.com/Video/Eur08-Sweden.wmv
Basically, I get my knee in, brace with my arms and push forward with my legs - it doesn't look it by my back is straight (otherwise it collapses like a house of cards!)
Excuse the efforts at being Sellbourg,,,, I've given up trying to produce short films...