The way I did it was:
- Stand with left foot on obvious high foothold
- Jump up and gaston the arete with right hand (just above my head)
- Right toe hooks low flake down and right (used on the sitter I think) and keeps you in balance
- Rock over 'til you can reach small pocket with left fingers
- Slap right hand out rightwards onto slab
- Now you're stood in balance....
...and the top moves are easy.
But there's several different methods other than this, but it worked for me, and I'm crap.