In reply to Greasy Prusiks:
This would be better demonstrated than written, but here goes:
Often people try too hard to pull themselves on to the wall, essentially doing a big row/pull up.
In many cases rocking over so that your weight, or more of it, is pushing directly over your feet means that you need to do a lot less pulling. This is less obvious on really steep ground, but still often true.
So... try finding a position where you can lock off your arms relatively easily then see how much of the first move can come from your hips (rocking over) or core (doing a sit up/crunch/twisting).
Sometimes a flag or drop knee rather than a rock over is what's required, but either way it's all about getting your weight onto your feet.
Good luck!