Re Rear Wheel Bearing
Changing the wheel bearing/hub is easy - a real DIY thing if you have the right socket, extension bars, jack, axle stands, etc. Just be careful when buying a spare to get the one with the notches for the ABS brakes. (The local agents first sold me the "wrong" hub, without the serrated (if that is the right word) edge.) Also buy the hub fastening nut, as you need to cut the collar to lock the nut. This is done by bending the collar with a chisel into the notches on the axle. This after you have torqued the nut to a figure between 266Nm - 294Nm. This is quite a high figure, and if you are inexperienced in these things, I would strongly recommend that you borrow a torgue wrench.
Scary story about the jack buckling - which just shows that the jacks sold with vehicles are only for changing tyres during emergencies and not for working on the vehicle. Few things scare me as much as a vehicle suspended on one of these jacks.