Before you begin, safety first! Completely shut off the main water supply to your house. Then, turn on the shower faucet to relieve any remaining pressure. This prevents flooding during the repair.
This DIY guide details the steps to replace a shower valve, including turning off the water, removing the old valve and handle, installing the new valve using plumber's putty and possibly compression fittings (especially for copper pipes to avoid soldering), and finally, reassembling and testing for leaks.
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