While a multi-screwdriver and Teflon tape are essential, it's wise to have an adjustable wrench or pliers on hand for securely tightening the new diverter. You might also find a utility knife useful for cutting away old caulk, and a flashlight to better see into tight spaces.

If you can't locate local shut-off valves for your shower, you'll need to turn off the main water supply to your entire house. This is typically found near your water meter or where the main water line enters your home. Always ensure the water is completely off before starting work to prevent flooding.

The most common cause for leaks after installation is insufficient tightening or improper application of Teflon tape. Ensure you've wrapped the Teflon tape clockwise around the threads 3-5 times, and gently but firmly tighten the diverter valve with a wrench or pliers until snug, without over-tightening.

Yes, this project is generally beginner-friendly as it primarily involves unscrewing and screwing parts. The 3-hour estimate is reasonable for someone with basic DIY skills, but prepare for potential delays if old parts are stuck or if you need to locate a main water shut-off.