To replace a bathroom sink faucet with a new design or touchless model, start by turning off the water supply and removing the old faucet. Install the new faucet by following the manufacturer's instructions, connecting the water lines, and securing it in place. Test the new faucet for proper operation and make any necessary adjustments.

Replacing a faucet with a new design or touchless model involves installation and connection. Benefits include modern features and enhanced convenience. Challenges include proper installation and setup. Effective replacement updates both functionality and style.