I can comfirm its a bit of a ballache of a job. I don't recall needing a special tool, but it was unbolt driveshaft, caliper, disconnect handbrake cable, etc.
Probably fine on a 2 poster ramp, but awkward to do your back, and if you're paying a garage to do it probably 3 times the labour costs of a rear disc change on anything else. Not difficult, just a lot of it and tiresome to do at home. Certainly wouldn't justify getting shot of one for needing rear discs alone.