Replacing the belts is a fairly easy job (for a Fox!) and should only take a couple of hours. You need to disconnect the flexy coupling on the exhaust, remove the bolts from the spine of the engine deck. Hook the rear armour up to the crane, take out the bolts and lift it out the way. The heat exchanger bolts through the fan pack, remove that first and we usually stick a block of wood under the heat exchanger to keep it in the same place. Thre are 2 bolts connecting the fan pack to the top of the engine, and 8 or so at the bottom. You can slide the fan pack off the drive coupling and rest it on the floor. Assemble in reverse order.
While you have it in bits, you should replace all 3 belts. The numbers I have for them are:
Generator: 249D
Steering: 390H 341
Fan: 345L 137
Chris