Walk to one of the corners of the room and get on your hands and knees with a pair of pliers.
Grip the corner carpet fibers in the jaws of the pliers. Pull straight up toward the ceiling to lift the carpet off the tack strip nails; then pull straight in toward the center of the room. Repeat this process in each corner.
Go back to the first corner and work along the wall using the same process of gripping, pulling up and then pulling out. Repeat this process until all the edges of the carpet are free of the tack strip.
Roll the carpet up and haul it out to a trash receptacle.