To convert a tub faucet to a shower, remove the spout, clean the underlying wall, install a diverter spout, attach a handheld shower head hose, check for leaks, and caulk the spout. This project requires a wrench, pipe tape, pliers, caulk, a diverter spout and a handheld shower head.
Remove the faucet spout, and inspect the water pipe. If the faucet was attached to the pipe with a metal nipple, clean the nipple thoroughly. Replace it if it is heavily rusted. Clean the wall surrounding the pipe, and apply silicone caulk to small chips or gaps. Let the caulk dry according to the manufacturer's instructions.
Cover the exposed end of the water pipe with three layers of pipe tape. Screw a diverter spout onto the pipe, and attach a handheld shower head hose to the spout. Turn on the water, and lift the latch on the diverter spout to send the water through the shower head. Check all of the connections for leaks, and then turn off the water.
Apply caulk around the perimeter of the diverter spout. Check the drainage hole at the bottom of the diverter to verify that it is not blocked by the caulk. When the caulk cures, the shower is ready for use.