While the Milwaukee screwdriver is a good quality tool, any standard flathead and Phillips head screwdriver of the appropriate size will work. Ensure the screwdriver tip matches the screw head size to prevent stripping the screws during removal or installation, which is a common issue.

If you can't isolate the shower's water supply, you'll need to turn off the main water supply to your entire house, usually found near the water meter or main shut-off valve. If water still drips after turning off the supply, double-check that the valve is fully closed. For persistent drips, you might need to address the shut-off valve itself or consult a plumber before proceeding.

Often, old screw covers can be stiff due to mineral buildup. Try gently prying around the edges with a thin, flat tool like a plastic putty knife or the edge of a flathead screwdriver wrapped in painter's tape to avoid scratching. If it's still stuck, a small amount of penetrating lubricant applied carefully around the edge might help loosen it, but wipe away any excess immediately.

The 45-minute estimate is generally realistic for someone with basic DIY skills and the right tools on hand. However, as a complete beginner, it's wise to budget an hour or two. This allows for potential issues like stuck screws, locating your main water shut-off, or needing extra time to review instructions carefully.