Wasn't there when it was done but my mate had the rear bumper off fixing a dent after someone hit the back of it.
said it took about 20-30 mins and was very easy. few screws/ bolt underneath but all very reachable and then it comes off.
hope that helps you, but it's always been a case of get out there and try it, if you fail then come back looking for some more help. lol.