Some of the larger jobs may be too large a scope for a handyman, but that is why a free estimate and consultation should always be provided. Most handyman repair professionals will not touch a job involving the structural integrity of a building or attempt a major electrical trustworthy drain leak repair due to liability. The risk is too high and safety should always be paramount.
This is a highly specialized job and you might not know exactly what to do. Many DIY enthusiasts end up creating a bigger problem than before when they try their hand at repairing kitchen or bathroom leaks. An experienced plumber, on the other hand, will be able to solve the problem easily. This person will also be able to identify potential problem areas and pre-empt any issues there.

Check and make sure that the tradesman local water heater repair service has a plumbing license This is a very important step as you need to be sure that the man you are hiring for the job is a professional. If there was any damage to your property or bathroom it becomes much easier to make insurance claims if your tradesman is licensed. So make sure you check this before you start any work.
Friends and relatives will have suggestions on who they have used in the past and they will know which ones are good and which are bad. They would never tell you to use someone that they themselves would not use. So when you don't have time to do any research, just ask a friend or relative.
You are better off hiring a well-known faucet repair company that you trust over a random person off the street. There are many dishonest people out there, so find a company that you can depend on and you will have peace of mind.
There are three things that you should look for in any type of repair service that you are considering utilization. You want them to be not only licensed and bonded but properly insured as well. This means that the business you are dealing with is a completely legitimate one that is not illegal. You don't want any average Joe doing these type of repairs for you.
A reputable plumbing service will often make suggestions when you initially contact them. In the case of a clogged drain, for example, they have seen hundreds or even thousands of cases just like yours and they know that most bathroom sink clogs are the result of by hair building up in the drain. Accumulated hair can create a plugged drain and it can be a fairly straightforward job to loosen up the clog and have a free flowing drain again.