that's the part that made me almost throw my PC out the window! Luckily, I calmed down, took a breather and returned and I finished it. God that was hard!
As for the part where you're climing the fences and he's in the middle of the circle, just climb each one to the very top, jump up slightly to get on top of the rail and then jump to the next fence. Do not try to jump from wood thing to wood thing cuz you won't make it. Just jump from the edge of the wood thing onto the side/fence of the next one.