Jack car up, support on the body (rather than the rear beam)
Remove wheel.
Inside the car, loosen the nuts that secure the strut from the top (access from the boot)
Outside the car, remove the big f-off bolt that secures the strut to the rear beam
Marvel at the damper in your hands
You can remove the rear spring without spring compressors normally, so just unwind the nut that is holding the top mount on & it'll be in bits
Reckon that'll take you an hour... if you're feeling strong & the nuts all free up easily