If your toilet, or water closet, is old or in need have repair, you may find it's cheaper to install a new one than to patch up the existing one, especially if you do the job yourself. Installing a new toilet is actually a rather simple plumbing procedure that can be accomplished in just a few steps. To install the new toilet, you'll need a new toilet gasket and two 5/16-inch bolts to mount the bowl to the floor flange, but most of the required parts will be included with the new toilet.
When removing the old toilet, shut off the water supply to the tank and flush the toilet. Use a bucket or cloth to remove any leftover water in the tank and bowl. Using a pair of pliers or small pipe wrench, remove the nut connecting the water line to the ball cock valve at the bottom, left side of the tank.