Loosen the lug nuts on your tire. Use the tire iron, turning it counter-clockwise and only loosen the nuts a quarter of a turn.
Chock the wheels. You can do this with a couple of large rocks, placing them in front of and behind the rear tires, to keep the car from rolling.
Jack up the car. Put the jack just below the wheel well on the frame. The frame runs along the outer edge of the car.
Remove the lug nuts and take off the tire.
Check the brake pads. If there's over a quarter of an inch of pad left, you don't need a brake job and the squeaking could be from something else.
Squeeze down the calipers using a hand vice or large pliers.
Take off the old pads by popping off the clips with a flathead screwdriver. At this point, the pads should come right off. Keep the clips, if you can, to reinstall on the new pads.
Put on the new brake pads. They should simply slide right in to place.
Put the wheel back on and tighten the lug nuts with the tire iron, turning it clockwise. You'll have to recheck the nuts once the car is down off the jack to make sure that they are tight.
Repeat steps 1 to 9 on the other side of the car.