While classified as beginner, this project requires patience and attention to detail. The 4-hour estimated time is reasonable for someone with basic DIY skills, assuming no major plumbing issues or modifications are needed. Rushing can lead to leaks, so allocate ample time, especially for thorough testing.

Always turn off the main water supply to the bathroom or the whole house before starting any work. Disconnect any electrical outlets or lights near the work area if present to prevent electrical hazards. Wear appropriate safety gear like gloves and eye protection, especially when handling tools or old plumbing parts.

Yes, a bucket is essential for catching residual water during the removal of the old sink. You'll also likely need plumber's putty or silicone caulk for sealing the drain, a caulk gun if using silicone, and a flashlight to see into tight spaces. Channel locks or a basin wrench can be very helpful for stubborn nuts.

The most common leak points are usually around the drain assembly, the P-trap connections, or the supply line connections. First, ensure all nuts on the P-trap and drain assembly are hand-tightened, then use a wrench for a final snug turn without overtightening. Also, check the supply lines for secure connections at both the faucet and the shut-off valves.