Hi Roland
1. Put the car on a lift/axle stands and remove both rear road wheels
2. Remove both rear arch liners and rear bumper under tray
3. Pack the tailpipes with rags so they dont scratch the rear bumper
4. Undo the front crossmember and drop the front of the exhaust
5. Undo the rear link pipe brace
6. Undo all the clamps and knock the whole system forward
7. Undo the rear box hangers and remove wiggle and remove the boxes from the car.
If I were you, do it on a car lift or just pay someone to do it, its a lot of mucking around with rusted nuts and bolts, and trying to separate seized joints.