this is looking really interesting so far... but i'm stuck on the easiest setting:
how to explain where might be kinda difficult, but i'll try:
spoiler:i'm on a ledge that is pretty rectangular except for a perfect triangle cut out of the middle-front edge & right behind me is an entrance with a big hole down - i can use the grappling hook and get up higher & see in some kind of windows, but can't see a way to mantle up onto that ledge
is mantling onto this ledge the only way to go and i just have to go about it differently or something (i'm always going flying off when i try)?
if my description of where i am even makes sense 
any help would be appreciated!
cheers