Wheel Bearings are very easy to replace. In most cases, you will need a torque wrench.
New wheel bearings can be purchased online from http://mibearings.com
they have very good quality bearingsHow do i change the rear wheel bearing on a 1999 dodge stratus?
Disc or drum rear brakes? Really not much harder than doing a front wheel bearing on an old rear drive car, remember them? Remove the drum or caliper and rotor, remove dust cap, remove nut{might be easier to pry off cap and bust nut loose with car still on ground}. The hub/bearing assy should come off, may need puller. Reverse steps with new hub and tighten to torque spec. think its 185 ftlbs. Use a new nut included with hub.