If your shower is leaking, then it is not only increasing your water bills, but also wasting a lot of water which is unfavorable for the environment. In order to fix the leaky shower, first of all, shut off your water valves and then drain out the excess water. Open the screws holding the handle off and take both hot and cold off. After the handle is off, take off the water guard. Open the nut that has held the stem in place. Open the shower stem in anti-clockwise direction. Replace the washer located at the end which goes into the pipe.
Replace the packing washer at the middle section of the stem. Clean the debris from pipe and then put together the parts in reverse order. Recoil around the shower faucet guard to give protection to your wall from any possible damage. In this way, you will be able to fix your leaky shower on your own.