Are you sick of your old faucet hardware or the builder grade faucet in your new home then hopefully this can help you gain some confidence in changing it out yourself. Keep in mind I am not a trained professional, but I have changed many faucets successfully.
Clean everything out from under the sink and turn off the water under the sink. You DO NOT need to turn off the water to the house.
2. Unscrew the white pipe, AKA the two pipes that are running up to the faucet.
3. Unscrew the bolt that is holding the faucet to the sink. Once that is unscrewed you can pull the old faucet off.
4. Put your new faucet on. Mine came with some plumber nuts that I used to screw the faucet to the bowl. Keep in mind faucets and bowls are going to vary as are the supplies that come with them.
5. Now we need to reattach the water lines. The faucet I purchased with came with new water lines and I liked that they had them marked one for hot and one for cold. I use plumbers tape around the fitting and then go ahead and make sure everything is really tight.
6. Turn the water back on under the sink. Test to make sure everything is tight enough by turning on the faucet and checking for leaks. I usually let the water run for a few minutes and monitor under the sink. If there are leaks I would need to unscrew the pipes again and add more plumbers tape and retighten to make sure everything is really sealed up.
SINK PLUG OR STOPPER
1. Unscrew the drain. This is easier than it sounds. Unscrew the plumber nuts and the nut that is against the sink bowl holding the stopper in place. Once those are all unscrewed you can simply remove the drain from the sink. You might need to use some pliers to remove the rubber gasket holding the drain in place.
2. Replace the old stopper with you shiny new one. For the one I purchased I just set it right in the hole. I didn't need to use any plumbers putty or sealant because this drain is self sealing. Meaning there is rubber gasket that goes underneath the bowl and as you tighten on the nut it tightens everything together and forms a water tight seal.
3. Screw the rest of the P-trap drains back the way they were and you are done! Turn the faucet on and check for leaks. I usually do this a few times throughout the day before I put everything back under the sink.