I just disassembled/reassembled my first rotors. It wasn't that hard. First I removed the caliper bolts with a 3/8" allen wrench. The caliper comes off next obviously (I set it atop the axle housing because it's attached to the brake line). Then with a pair of needle nose pliers I removed the pin holding the castle nut. Now taking a pair of channel locks I unscrewed the castle nut (lefty-loosy facing the back of the rotor). The rotor came off with ease (I caught the tooth washer and the ball bearing). Usually you need to replace the grease ring so I put the castle nut back onto the spindle (the whole rotor is placed on the spindle). I then put the rotor back over the nut and pulled it back off the spindle while grinding against the castle nut (easiest way) and the bigger ball bearing and grease ring fell out. Took off the castle nut... If you want you can always paint the caliper, hub, or replace brake pads, take measurements, whatever. Repack the bearings by dumping in some ol' greasey grease.
To reassemble I replaced the bigger ball bearing (bigger angle closest to the rotor), new grease ring and pounded them into place. I then put the Rotor onto the spindle. The smaller ball bearing (smaller side closest to rotor) and tooth washer were next. I hand snug the castle nut. To properly torque the castle nut listen up closely: Take the channel locks and grab the nut. Spin the rotor (perferably forward) and tighten (righty-tighty facing front of rotor) the castle nut until the rotor stops spinning. Loosen one spot (the spot being where the pin goes in). Insert pin, bend to close. Replaced the caliper like it was. Finally I hand torqued the caliper bolts and I was done.
I didn't think this would be a install guide (for obvious reasons) but I know for some of you this is what you always wanted to do in life and I beat you to it.