Contractors will often use glue to fasten the foam or felt under the carpet to the floor. This way, the scrap wood will take the punishment, not your floor. Place thin scraps of wood between your tool and the floor. This way the scrap wood will take the punishment, not your floor. A good pry bar should have a hooked section on one end, a straighter area on the other, and a nail removal "oval" near the straighter end. With a touch of practice you can make this long job.