The first thing that you are going to need to do is to measure the bathroom faucet fixtures that you intend on replacement by taking the length between the outermost knobs and other important measurements depending on what type of fixture you are replacing. It would be best for you to simply remove the product and bring it with you to the hardware store if possible, but know that this is not always possible depending on what type of bathroom faucet fixtures you are dealing with.

This will give you an idea of what magnitude this project will be, before you decide upon a bathroom fixture and go about attempting to install it. The biggest installation challenge for you to consider is going to be the process of completely removing the fixture from the back of the wall. There may be an access panel behind the fixture but this is not always the case.