I too found myself bound and whimpering to that tree many years ago, as have many before us.
The funny thing is, once I was starting to lead 10's I went back and it didn't seem quite so bad. Maybe solid 5.9.
There is no heel hook required although I suppose you could for the final move.
I'm 6'3" and cannot get a rest anywhere. I've seen people throw a left knee-bar in there midway before moving right but I couldn't make that work although I saw a place where someone with a much shorter leg could probably do it.
So I don't think there is any trick. Just have your gear ready to place, hang on straight arms, and KEEP MOVING!