I replaced the cab mounts on my truck this weekend. It's a real pain if all you have is a hammer and chisel to break the spot weld on the front mounts. The bolts all came out fairly easy after I gave them a good tug with a 1/2 drive ratchet and pipe
The back mounts were actually in pretty good shape. The front mounts crumbled when I pulled them out. I did not do this safely, so I will not be describing how I changed them. I did change them one at a time so the cab wouldn't move.