Depends on how much you value $ & dislike a hassle. I will say that the 2nd time you do them, it'll be a piece of cake. The 1st time, you'll likely run into some headaches.
I'm assuming you have solid rotors back there. I had great difficulty trying to find someone who cuts rotors around here, so I'd strongly suggest that you replace them as well. Retail, they're usually pretty cheap, maybe $30 each.