Hi, It depents on how bad the box section they bolt onto is eaten away by the steelworm. You'll have to undo the whole back axle. 12 bolts on al the mounts. The brakelines have to be disconnected.
If you have a GTL you'll have to undo the handbrake cables. And both the shock absorbers have to be undone.
It can be done but if you don't have the tools and patience. You might as well have it done by your garage and hand over a lot of euro's.