When it comes to removing and replacing the bevel box, believe me it ain’t hard. I’m no professional mechanic, but I even did it with no problem! Twice actually, firstly to paint the 07 R111 and recently to give the splines a grease on my 2009 Classic.
A tip, when removing the box, try to pull it off straight and don’t move the connections. When replacing it back together, use a long piece of string scrunched up, to keep the shaft central. Leave a bit hanging out, so once you get it lined up and partly on, you can pull the string out before pushing the bevel box home. Just take your time mate.