You'll need some big, strong snap ring pliers to remove/install the big retaining ring. Otherwise, it's pretty easy. Like Tman says, replace the o-ring, so it doesn't leak.
Most tedious part is removing the exhaust system to get access to the transmission cover. In my case, I could remove the muffler, loosen the headers at the cylinder heads and gain enough clearance to get the cover screws out.
After my 6th beer and removing old cable must have messed up the threads retaped and no problems. All back together. Just had to remove heat shield had a small Allen that fit in there didn't have to remove exhaust.