piss easy mate i've done it on my mk1 2l zetec (rear discs)
1. disconnect abs sensors, brake flexi hoses and handbrake cables including the little bolts securing them to the trailing arms.
2. remove shocks. little nut at top, 13 or 15mm iirc bolt on the bottom
3. remove the 4 bolts tucked under the body honding the big bush end of the trailing arms.
4. now your left with the 4 or 6 (think its 6) subframe bolts. remove them and the whole rear suspension drops out, subframe and all.
haynes manual is usefull if you get stuck.
the tricky bit is removing all the suspension arms. they often need cutting out (carefully if you want to retain the arms for fitting poly bushes) as the bolts sieze into the bushes. consiquently when you undo the bolt you end up tearing the bush apart.
if any work ever needs doing on the rear suspension the easiest way of doing it is to drop the whole lot as it makes FAR better access if you need to carefully cut bolts etc.