Zoom: It's easy as falling off a log. First unbolt the caliper and suspend it out of the way with a piece of clothes hanger. Next if you're still running stock rims check for the clips that are used at the factory to hold the rotors on, if there remove & picth'um. Now remove the old rotor, you might have to whump on them with a rubber mallet to break them free, but they will come off over the lugs.
Now clean-up the hub (removed any rust), apply a thin coat of antiseize to the hub face and put on the new rotor. Re move the old pads and carefully push the pistons back into their bores (remove master cylinder cap) and install new pads. Remount the calipers and torque to spec.. Put your wheels back on and enjoy.