Make sure you replace the old flex brake lines while you're in there. Take a good look at the front bearings, and repack if in good condition...order the rear seals.
I just ordered the rebuild kits for all four calipers. Only had to rebuild the fronts. Get the Motive power bleeder. Don't put fluid in it, just use it to pressurize.
The rears are super easy, if you don't mess with the parking brake. One screw and the rotor is off.
The fronts take the most time...
Very doable... You can buy the best parts here at pelican, and still be $1000 ahead.
Pelican sells a brake kit package with everything you'll need.
http://www.paulsgarageblog.com/how-to-replace-the-front-brakes-and-wheel-bearings-on-a-porsche-911sc/