A question you may want to ask yourself is whether you like being a student. So are lessons worth it? Teachers can do something that we often will avoid: doing something new or unfamiliar. When we practice on our own, we may be reluctant to push ourselves.
After working at a music store for seven years, I observed all of the different teaching styles.
Lock, stock, stick to the book teachers: you will play out of the Mel Bay book page by page week by week. You are the student, and you will follow the teacher.
Teach you what you want to know teachers: you can bring songs to them, and they will tab it out for you. Of course they will also do the instructional book path if you want.
The constructivist: they will show you mostly things they know but are lacking on the "by the book" stuff. But they are usually very nice because they have to be.
The Philosopher: this teacher will just talk to you the whole lesson while you hold your guitar. Sometimes the talk will be about playing music, but sometimes it will just be stories from their own lives.
The Smoker/Philosopher: Same as philosopher except you will probably be standing outside while the teacher smokes and you listen. Other philosophers will surely join.
The late guy or gal: they will always be late and will try to reschedule often. They will also have to smoke after they arrive late for your lesson.
There are other sub-species of teachers out there, but the above were the most common. Consider the creepy teacher, flirt with mom teacher, too much cologne teacher, emotionally unavailable teacher, make you practice in the room while they smoke teacher, etc.
I would suggest trying to eavesdrop on some teacher's lessons to see what goes on. Some studios are set up where you can kind of linger in the hallway and hear what is happening.
But as an adult, it is sometimes easier to communicate what you want from a teacher. Maybe you want to learn a little more about walking bass lines. You could take lessons from a guitar teacher that can play chords over your lines. I heard that one a lot.
Taking bass lessons with a drum teacher might be interesting.
