Replacing the rear wheel bearings was one of the first big mechanical undertakings I ever did with a car. I replaced the rear wheel bearings on my 85 Celica GTS shortly after I bought it 11 years ago. The TSRM tells you everything you need to do step-by-step. If followed properly it can be considered somewhat easy, in a sense. The only special tool you'll need is an axle puller. Do the free tool rental from Auto Zone for this one. Attach the axle puller to the lugnut studs, give a few pulls on the handle ram and, bingo, the axle pulls out with ease.
DO NOT attempt what I did. I tried to hammer the axles out from the inside out. One side came out fine, the other side I totally boogered up the threads and was damn lucky that they could be rethreaded with a die and saved. Otherwise I would have needed to buy a new axle.
Also, you will need a socket or some other solid cylindrical object to use as a press when hammering in the new oil seals and bearing races.
If this is your first time set aside atleast a day, maybe the weekend so you can take your time, learn as you go and do it properly.
King of the hill,
Scott