Shut off the water supply to the bathroom faucet. Remove the old faucet and clean the sink surface. Follow the specific installation instructions provided by Kohler for your model. Install any required gaskets or plumber's putty onto the new faucet. Place the Kohler faucet onto the sink and secure it with the provided mounting hardware. Connect the water supply lines to the faucet according to the manufacturer's instructions. Turn on the water supply and check for any leaks. Test the functionality of the faucet handles and any additional features.