This is a pretty straight forward job. On a scale of one to ten, this rates at about a 6, so it’s very do-able for your average do it your-selfer.
This job is to replace the faucets in the kitchen or bathroom sinks. There are tools and supplies you are going to need and we will mention these in passing as we do the installation.
So you have made your selection for your new faucets and now it is time to put them where they will do the most good and that is in your sink.
First, turn off the main water supply to the entire house. The first tool you are going to need is a hacksaw. If you are unsure of the condition of the blade, get a new one that is intended for metal cutting. Get under the sink with a portable light of some sort and begin cutting the supply pipes to the old faucets. We are approaching this as if you do not have cut-off valves on these pipes. Once both pipes are severed take your basin wrench and loosen the nuts that are holding the faucet assembly onto the sink. Once these are removed the faucets assembly will lift completely off of the sink.
If you have metal plumbing in your home you are better off replacing the severed pipes under that sink with plastic. It is easier to work with and aside from having to use a torch to attach an adapter to the old pipes that will allow you to use plastic, a torch wont be needed again and that is a plus from a safety stand point.
Once your attachments are soldered and/or affixed to the old pipes you can go ahead with the installation of cut off valves. Use a two inch stub of half inch plastic pipe between the valve and the adapter. Once that is done go ahead and drop in the new faucet assembly. Tighten up the plastic hold down nuts and making sure the assembly is aligned and looks good. Now measure and cut a sufficient length of pipe to reach from the underside attachment point of the faucet to the top of the cut off valve. On the end of that piece of pipe you need to glue on an adapter. This is how the piping is attached to the underside of the faucet. Be sure and use some plumbers dope on these threads just for insurance. Do the same thing for the other side of the faucet and be sure and allow enough length of pipe to be inserted into the top of the cut off valve by about one half inch.
Now all that is left is to glue these two dangling pieces of pipe into their respective cut off valves and wait for the glue to dry and turn the water back on.
Notes on installing plastic pipe. I always like to use a little bit of fine sand paper on the ends of the pipe I intend to glue. This removes dirt, grit and plastic shavings left over from the cutting process.
Another good tip is you should not buy a large can of glue. Always get the small ones unless you know for sure you are going to need much more. I have found that this glue once opened, has a limited life span. It will gradually thicken and harden once exposed to air. So getting a large can and intending to use it again later, say a few months, is an expensive mistake. You will find you are out buying more glue.
A final note: Before turning the water back on after having installed a new set of faucets, you should remove the little screen air-reator from the tip of the faucet. This little hickey is intended to introduce air into the water stream and direct the flow of water all at the same time. But it is also an excellent trap for debris that always seem to get into a newly plumbed pipe system. Remove this little screen and then turn the water back on and let the water run through the new faucets for a few moments before replacing it, otherwise you may find you are getting a distorted looking water stream or even a sideways spray or something.
All these procedures are nearly identical with installing new faucets for a bath tub/shower. The major difference is the feed pipe leading up to the shower head and the fact that you will probably have to work from behind a wall or closet space to gain access to the plumbing.