If the shut-off valves are stuck or inaccessible, try applying penetrating oil and letting it sit. If they still won't budge, you'll need to turn off the main water supply to your house, usually located in your basement, garage, or outside. This is a crucial step to prevent flooding.

While adjustable wrenches are essential, a basin wrench can be incredibly helpful for reaching and loosening stubborn nuts in tight spaces under the sink. A utility knife or scraper can also assist in cleaning the old sealant effectively. Always have a bucket and towels handy for drips.

It's crucial to clean the sink surface thoroughly to remove all traces of old plumber's putty, silicone, and grime. Use a cleaning paste like 'THE PINK STUFF' and a sturdy sponge to ensure the surface is perfectly clean and dry. A clean surface ensures a proper, watertight seal for your new faucet.

The most common reasons for leaks are improperly tightened supply lines or mounting nuts, or an inadequate seal at the faucet base. Ensure all connections are hand-tightened first, then snugged with a wrench without overtightening. Always check manufacturer instructions for any specific sealants or gaskets required.