If its anything like removing the front bumper:
1) Looking from underneith the car undue the screws and bolts holding the black plastic bumper to the car (The Fron as 3 bolts and 2 screws either side)
2) Once this is done, look inside the wheel archs and you need to undo a bolt either side there to (With fron you can just turn your wheels not sure about rear)
3) Open boot and unscrew the 2 bolts/screws there.
4) Lift away carfully, with regard to reverse light, and also in case theres something still attached. If there is just put screws back in and find it.
Front bumper when you know where it all is is a 5 min job to take it off
ADO 15 told me how to do it: