When I was taming my yutyrannus it was a little ez, all you need to do is kill the carno or when the yutyrannus and carnos are fighting hit the yutyrannus and trap it,pit 9 stone block on the ground where you want to team it and 24 walls and 4 or 2 lage trap and leave 1 side open and if you want you can leave a dead body in the trap and block off the open side when you get the yutyrannus in the trap