Hey mate, as long as you have the basic mechanical knowledge its a reasonably easy job. The wheel bearing are actually one piece with the hub.
To replace them follow these steps.
1.Jack car up and remove the tyre
2. remove the brake caliper and cable tie up out of the way (careful not to kink the brake line)
3. Remove the brake caliper bracket from the upright assembly (should be 15mm from memory)
4. remove the brake rotor
5. remove the nut from the front of the spindle
6. the HUB should slide off towards you. (if it requires perswasion, beware of
ABS sensors)
Replacement if the reversal of those steps mate.
The new hubs can be purchased from most auto parts stores.