If you install new rotors, you have to pull the hub off. Then when you pull the rotor off the outer bearing will fall in your hand. Get a $3 seal puller to pull the inner rotor seal. Then use the front-end maintenance series of articles to guide you through this, including reassembly.

Redoing the bearings and seals will take much more time than the brakes. Brakes can be done in minutes, but the whole rotor/bearing/seal/hub thang will probably take 2-3 hrs one side, then half that on the other.

use Pemrtex Hylomar instead of the factory paper gaskets on the hub body and dial, makes subsequent work easier. Lather up the cone washers with anti-seize to make subsequent removal easier. And don't be afraid to whack the living **** out of the studs holding the cone washers by placing a drift on them and smacking that with a steel hammer.

If you read the articles, they walk you through step by step and you should also figure out which tools you need.

It really is easy work, it just takes a little time your first time.