I did mine a few years back, I dropped the whole beam and stripped it down in the garage (its bloody heavy and will require a couple of people). After stripping it down into its partsI cleaned everything up and painted it and then fitted it back onto the car a piece at a time. You'll need to fit the swing arms back onto the rear beam before you bolt it in.

You'll also need to use a press to get the bushes out of the swing arms.