It is easy to replace a bathroom sink faucet. You will only need some basic tools and a little bit of time. Even the absolute beginner can do this DIY project. If you are on a budget, then it is almost a necessity to do it by yourself, since plumbers can be expensive.
The first step is to stop the water. It's amazing how many self-made craftsmen forget this simple step. If you take the faucet apart without worrying about it, you will likely flood the bathroom before you can catch up with this step. You can purchase bathroom sind faucets online via https://www.kralsu.com/pages/bathroom-faucets.
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After the water is turned off, let the water run until there is no pressure anymore. If not, you will have to dry this water. Now you can start working on the sink faucet in the bathroom.
You will of course need a crane to complete this DIY project, but not much else. Buying a new crane isn't just about finding a beautiful crane at an incredible price. Not every faucet fits every sink. Some have two holes, others three.
Some have 3 inch holes, others 3.5 inches. Before shopping, measure the distance between the holes in your faucet. You don't have to disassemble the old faucet for this as you can measure it from below.
Your tool of choice is a wrench. You will also need a gasket and spatula to remove the old sealant. Sometimes you need a screwdriver, but nothing more. Often, if not always, it is cheaper to buy all of these tools than to hire a plumber.