What you will find is
1. there will be a series of plastic plugs across the back where the boot lid meets the bumper 5 in total.
2. 3 screws down each side of the wheel arch and 1 or 2 underneath depends if the car has mudflaps.
3. under the rear across the back there will be 2 plastic plugs.
4. on each side from inside the boot pull the carpet that is behind the rear lights and there will be 2 10mm headed nuts that you undo..
Then the whole lot should just come of with a bit of a wiggle..
See pic sorry my paintshop skills are not tip top but you get the idea..