Problems with jump on roof at dawnville

[Booki]

Hi everyone!
I'm trying the jump on dawnville in the ruins, to get on the roof (like the dawnville2 demo jump). However I can't pass the first jump, where you're supposed to crouch to get pass the corner. After I jump on the corner and crouch, my "head" seems to block the passage, even on the very edge. I always end up falling...
Is there some kind of trick, on the demo it seems so easy...

[RaVen]

If im correct on wich jump you are refering to the jump is very easy when you get the trick! First off go to jump at a 90° angle-facing paralel to the wall... jump up and pres right for a quick time so you get on the ledge. When you are on it dont press any more keys to move!! That is very important! Then just look in front and quickly jump-crouch and press forward almost at the same time! The jump was very tricky to me but now when i know the trick i can come up in 15s from the begining of the round even if i miss one jump