I have a barn that needs some structural repair. I am toying with the idea of cutting the beams and doing the joinery myself. I am no huge hurry but want to try and do it right. How realistic is it that I do this all by hand with the right hand tools?

I have not yet attended any workshops but am interested in recommendations on books that show how these joints are cut. I am mostly interested in simple mortise and tenon joints to start with. I have reviewed some books online but I thought I would ask the experts...Thanks