You don't need to jack the car up at all, but it will obviously aid you somewhat
Look under the rear of the car and there's 2 (I think) bolts securing the bumper to it.
Loosen the arch liners by removing the self tappers that run down the edge of the bumper.
There's 2 (again I think) more bolts securing the bumper to the inside of the rear quarter on each side.
Undo the 2 torx bolts on the tailgate slam panel.
I think that's it, 30 mins of a job really, just remember to unplug the number plate light!