I need a wall knocking down. Also need a doorway made in another wall. My neighbour has had something similar done and was told it was t load bearing. The beams are running along side where the walls are. I e asked a builder to do the work and he’s meant to be coming soon but I haven’t heard from him and I just don’t think he’s going to follow through. I’m wondering whether this is something I could do myself? Total novice when it comes to walls!!