a C-clamp is a basic tool that is usually used to clamp things down. for brakes, however, it is used to return the caliper piston to it's original position. Brake pads are easy and quick. If you are changing or resurfacing the rotors, you will need an impact driver, which is a screwdriver that you hit with a hammer to loosen the screws holding the rotors in place. sometimes, the rotor binds to the hub, and you need a screw of the appropriate size-pitch to work it loose. I forget what those dimensions are, though so, look around.

other than those things and a good jack and jackstands, you're ready to go.

also note that the rear caliper pistons do not return like the fronts do, for the rears you can use either a very BIG flathead screwdriver to insert into the slots, and rotate them back into position, or a "caliper tool". I just use a screwdriver. oh and don't press the brake pedal with the calipers loose.