You'll almost certainly need an Allen wrench or hex key set for the handle's setscrew. A utility knife can be helpful for scoring old caulk or stubborn seals, and a flashlight improves visibility in tight spaces. Pliers might also be useful for gripping and turning any stuck nuts or components.

If water still drips after turning off the local shut-off valve, it might be faulty or not fully closed. Try turning off the main water supply to your entire house, usually located near your water meter or main shut-off. If the problem persists, you may need a plumber to inspect or repair the valve before proceeding to avoid water damage.

For corroded parts, apply a penetrating lubricant and let it sit for a while to help loosen rust. If caulk is the issue, carefully score around the edges of the escutcheon with a utility knife. Use gentle prying with a non-marring tool, like a plastic putty knife or a wide, flat screwdriver, to avoid scratching your shower surround.

The 3-hour estimate is realistic for a straightforward replacement with easily removable parts. However, older fixtures, significant corrosion, stripped screws, or unexpected compatibility issues with new trim can extend the project duration. Always budget extra time, especially if it's your first time tackling this type of DIY.