Remove the door from the original hinges with the Phillips screwdriver. There are typically three hinges with two to three screws each. Set the door aside.
Remove the original hinges from the trim around the door. You may dispose of the hinges, if you wish.
Attach the spring-loaded hinges to the door in roughly the same spots as the original hinges with wood screws. You may need to make more screw holes with a power drill if the holes on the spring-loaded hinges do not match up with the holes in the door from the original hinges.
Line the door up against the trim and attach the open side of the hinges to it with wood screws. Tighten all screws and swing the door to test it. It should pull open, then gently close by itself when you let go.