Trickles 21 at Narrabeen Slabs

See this video, as it's only 40 seconds. This wasn't me, but my friend. I was recording him last october. Last Saturday I went up a bit farther than him, but couldn't make it too. So its still our homework to find how to move. I hope it must not be so hard for me as its graded 21, but it probably requires the sequence that i don't move naturally. When I was on the rock I didn't have time to think much how to move as I constantly was fighting against gravity. Sounds very good puzzle, isn't it? It truely is.