If you think you want to learn to sing by “taking a few lessons” then go ahead. You might find a bit of information helpful, as long as you are a pretty good singer in the first place and as long as you are only going to sing at church.
If, however, you expect to sing in public, or expect to someday be paid to sing, or have aspirations to be well known as a singer, and you think you can “get by” with a “few lessons”, good luck. You might be OK. You might, indeed, have good luck. But if you don’t have good luck, you could end up worse off than you were before you took any lessons at all. You could spend a very long time learning a lot of nothing which can have dire results. You might lose the ability you have naturally and even end up with vocal pathology (illness). You could end up hating singing (I’ve seen that many times).
The only way you could avoid that would be to have information about what good singing is, and why it is good. You would need some musical information, too, like what it means to sing “off-key”, and what it means to “perform” for an audience. If you didn’t know those things and you didn’t even know that this kind of information was available (this is typical) you could waste a lot of money on lessons and spend many years studying before you understood the “lay of the land”. Plus, you would still have had to do a lot of work along the way.
The problem is that there is no general book on singing and expectations thereof. How would the average person know or understand the “mysterious” process of? (That’s being kind.) There are no general reference books about this topic. Not one.
There a hundreds of books by singers and teachers of singing about the process, each with a singular point of view, but none of them take a generic look at the process in simple human terms. Too bad. We need one.