No, you do not need to hire a professional plumber to replace a bathtub faucet cartridge or tub spout, as these are standard DIY tasks that require only basic hand tools like an adjustable wrench and screwdrivers. However, if the project involves cutting into finished drywall to replace the entire concealed brass mixing valve body behind the wall, hiring a licensed plumber is recommended. Verification: Shut off the water supply and test your repairs to ensure zero leaks.
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