I changed mine today,
As valpacer said not hard to do, only issue I had was getting the C clip on as the new CV didn't slide on far enough.
I just ran a file around the edge where the CV butted up against and it fitted fine (the downside of buying off the internet)
New & Old
Number stamped on old CV, don't know if this will help
ME66739AGJ 010B &
GKN IND 2081630 0106 ZOB
"C" clip that holds the CV on
The cleaned up spline
New one greased & fitted