Before installing the new faucet, you should remove the old one. The sink is the most important part of the kitchen. If the sink is 17" high, you should buy a 19" high-quality replacement to avoid damaging the rest of the countertop. Then, you can proceed with installing the new kitchen faucet. Once you've installed the new faucet, clean the area underneath it to prevent water damage. Afterward, you'll need to install a new drain valve.