take out the 2 bolts per caliper and the caliper comes right off. (make sure not to let it hang.)
take the old pads out, lube the back of the new pads and bolts, press in the caliper pistons,( use a c clamp or brake kit) put the new pads on and bolt everything back up.
just check your fluid level after words and to a couple of slow brake tests to see if everything went ok.
and if you are doing the rear calipers you will need either a set of pliers or a special tool to depress the rear pistons in. they turn as they go down unlike the fronts which just push in.
Good luck and let us know how it goes
you will probably need to have the rotors turned at a shop or purchase new rotors too if it has gotten to that point. new rotors are about 25 bucks, or you can have stock ones turned for about 10 bucks at a shop.