If individual tub shut-off valves are missing or malfunctioning, you'll need to turn off the main water supply to your entire house. The main valve is usually located where the water line enters your home, often in a basement, utility closet, or near the water heater. After turning off the main supply, open a lower-level faucet to drain water from the pipes before proceeding with the tub faucet replacement.

While the basic tools will suffice, a deep socket set (specifically for valve stems) or a basin wrench can be incredibly helpful for accessing and loosening nuts in tight spaces. You might also want a utility knife or scraper for removing old caulk or plumber's putty, and a flashlight for better visibility under the tub.

For a beginner, this project typically takes between 1 to 3 hours, depending on how easily the old components come apart. The cost of a new tub faucet can vary widely, from around $50 for a basic model to several hundred dollars for high-end designer fixtures, so choose one that fits your budget and style.

Common mistakes include not completely turning off the water, overtightening connections, or failing to use enough plumber's putty or thread sealant where required. To prevent leaks, ensure all connections are snug but not overtightened, apply plumber's putty consistently under the new faucet base, and always test for leaks thoroughly before closing up any access panels.