While 3 hours is a reasonable estimate for an experienced DIYer, beginners should budget 4-6 hours. This allows extra time for troubleshooting unexpected issues like seized parts, locating shut-off valves, or carefully following manufacturer instructions, reducing the likelihood of mistakes.

Beyond a screwdriver, you'll definitely need an adjustable wrench, plumber's tape (Teflon tape), and perhaps a utility knife or flathead screwdriver for prying. A bucket and old towels are also crucial for catching any residual water and protecting your bathroom floor.

Most homes have a main water shut-off valve near the water meter, usually in the basement, garage, or outside. If you cannot locate specific shower shut-off valves, you must turn off the main supply to the entire house. If you're still unable to find it, it's best to consult a professional plumber for assistance.

For stuck handles, try applying penetrating oil to any visible screws and letting it sit, then gently pry with a flathead screwdriver or apply firm, steady pressure while wiggling. For showerheads, wrap a thick cloth around the base to protect the finish, then use an adjustable wrench for leverage, turning counter-clockwise. Avoid excessive force to prevent stripping screws or damaging pipes.