Please use details. I am wanting to change my faucets. I'm okay with doing things myself so, I thought to install it on my own. Help, please, with the removal and installation. Thanks.
It would actually be helpful for you to go to a home improvement store and ask the people in plumbing. They can then show you what you're going to be up against, and how the various faucet models are fastened into the sink. Usually, for the type of faucet with two handles on either side of the spigot, there is a threaded water pipe coming down from the bottom of each valve. These then fit through the holes on the edge of the sink and you slip what's called a spanner nut onto these pipes, and tighten them up to fasten the faucet to the sink. You then attach the water supply lines to these pipes. For the types of faucet with the single handle in the middle, you may only have one threaded pipe with the water supply lines running up through it. One issue you may have in accessing the spanner nuts is that there's not enough room between the sink and back wall to access the nuts. In this case, you'll need a tool called a spanner wrench, which is basically a crescent-shaped metal clamp on the end of a metal handle that clamps down onto the nut when you turn it (ask the sales person in plumbing to show you one). Removing the old faucet can be the hardest part, especially if the old parts are rusted or corroded in place. You can also very easily break or strip old water cut-off valves when removing the corroded water lines, which will require that you replace them with the correct type (and you'll have to turn off the main water supply valve to do so). When you purchase the new faucet, you'll see how it gets connected in the instructions on the box. Various models have somewhat different actual mounting hardware. But, they're all basically the same (a type of spanner nut).
There is also a video on this site (I think it's on the second page)
