Removing an old faucet isn't difficult, but you'll have to spend some time on your back under the sink. To keep your under-sink time to a minimum, try using a couple of tricks – penetrating oil to make nuts easier to remove, and a basin wrench that is made specifically for reaching up and grabbing the tailpiece nuts. A basin wrench isn't expensive and is worth every penny when it comes to relieving back strain and frustration
There are 3 steps to completing this project:
Turn water off. Apply penetrating oil to the tailpiece mounting nuts and the supply-tube coupling nuts. Wait about 15 minutes for the oil to work, then remove the coupling nuts with a basin wrench or water-pump pliers.
Remove the tailpiece mounting nuts the same way (a basin wrench has a long handle that makes it easier to use in tight areas).
