To take the bumper off there are just 4 bolts, look underneath and you'll see the 2 big metal supports either side and the bolts holding them on. Unfortunately the nuts are square jobbies that just sit in a square hole if you get me, so they can pup out when you try to undo the bolts. Takes a bit of a fiddle to get them back into the slots, but shouldn't take more than 30 minutes to swap the bumper if the bolts arn't totally siezed.