jack car up and put onto axle stands, remove wheel, take off brake caliper, hang this up so you do not strain flexible hose, remove brake disk, take wheel bearing hub off, go to a local garage and ask if they can press out your old bearing and press new one in.(some will do this for about a tenner, just need to ask around), refitting is in reverse,you might need to replace some of your lock nuts, if you can get a haynes manual for your car, this will show you in great detail how to replace wheel bearings.
hope it helps, August 2010