What ratuna said, except pick up some brake cleaner too.
I'm terrible with mechanical stuff, but when I first got my jeep I needed to change the front brake pads and didn't have much cash so my friend helped me do it. I should have changed out the rotors at the same time but didn't.
It's super easy to do and saves you some money.
p.s. I followed the instructions here: http://www.4x4xplor.com/disc-brakes.html