Position the jaws of the nail puller around the nail that needs to be removed. Move the fulcrum lever at the side of the jaws down, if necessary, so that the point that juts out at the top is flush with the surface in which the nail is embedded.
Strike the top of the nail puller with one sharp blow of a hammer. Check to see that the jaws of the puller have grabbed the nail. Strike the top of the puller again, if needed, to make sure the puller jaws securely grip the nail. Reposition the jaws if they have slipped and closed away from the nail.
Pull the top handle of the nail puller toward the side of the surface on which the fulcrum lever rests until you completely remove the nail.
Place the nail puller, jaws down, over a garbage can or other waste receptacle. Push the fulcrum lever toward the jaws of the puller to eject the nail from the jaws into the waste receptacle.