The following is just a guide and not to be taken as a definative proceedure. I will take no responsibility for any damage or personal injury suffered from following it.
Right thats the legal bullshit out the way
Tools required
Breaker Bar
Ratchet
14, 17, 19mm sockets
Hub nut socket (32 or 36mm)
Mallet
Bearing pullers
Pliers
1) Remove the centre cap from your wheel (you may need to remove the wheel to get this off and then refit the wheel) and remove the split pin (if you take the wheel off you can do this before refitting it). Crack off the hub nut. It would appear some cars are 36mm but some are 32mm, this may be age related as my 2000 registered car had the 32mm.
2) Jack the car up and support it correctly then remove the wheel.
3) Release the handbrake (making sure the car will not roll) and remove the caliper (14mm socket)
4) Remove the caliper bracket from the hub (17mm socket) bare in mind the bolts are made of cheese and the following can happen
5) Remove the disc - if its on tight it can be released by using 2 M8 bolts in the threaded holes on the centre of the disc.
6) Now undo and remove the 4 hub securing bolts (19mm socket). You can get to the bolt heads by revolving the driveshaft until one of the 3 impressions line up with each one in turn. Now fit the bearing pullers to the end of the hub
7) Wind the slack out of the pullers and withdraw the hub assembly off the hub carrier. You may need to use the mallet to help ease it off now and then whilst still winding in the pullers until its off.
You now have the hub assembly that needs seperating with a press
Once this is done fit the new bearing assembly and then bolt it all back together in the reverse order to removal