Don't powerclean around breakables
The way I learned it is like this:
1) Set the bar over the balls of your toes (you do this) and your hips between your knees and your shoulders (I can't get more specific, it depends on the person)
2) Start the first pull by pushing the legs into the ground. Your upper body should remain more or less at the same angle to the floor as in your set-up.
3) When your legs are almost straight (ALMOST!! but not quite, otherwise your leverage will be shit. You should be in a high RDL position-ish thing), the bar should be above your knees, and you explode the bar up to your shoulders.
4) Rack the bar on your shoulders proudly like the man you are.
Hope this helps.
Rippetoes is also recommended.
As is Dan John's free book on oly lifting, lifting from the ground up. I think it's at danjohn.org