This project is rated as beginner-friendly, but can be challenging if parts are severely corroded or access is difficult. Expect it to take 2-4 hours, assuming good access and no major complications, plus additional time for final leak checks. The duration can extend significantly if you encounter stubborn old components or need to create an access point.

Absolutely always start by shutting off the main water supply to your home to prevent any accidental flooding. Wear appropriate eye protection to guard against debris and ensure you have plenty of towels and a bucket ready for residual water in the pipes. If your tub has an electric shower or jets, verify the power is off as well.

You will definitely need plumber's putty or Teflon tape to properly seal all threaded connections and prevent leaks in your new valve. Keep penetrating oil handy for loosening corroded parts, and have a flashlight, a bucket, and plenty of rags or towels for any residual water. New escutcheons and handles might also be required if they don't come with the new valve.

A common mistake is not applying enough (or improperly applying) Teflon tape or plumber's putty to all threaded connections, leading to immediate leaks. Another error is over-tightening plastic fittings, which can crack them, or under-tightening metal ones. Always double-check every connection and slowly turn the water back on, observing carefully for any drips or moisture.