yeah, if you can afford lessons go for it. When I went for lessons I knew I wanted to study classical guitar and go for practical exams and because I was of a certain standard when I went in I quickly progressed. All he did when I went in was he asked me to play a piece I knew, so I did, he gave me some tips on how to improve my wrist position, posture etc. and it worked from there.

The most important part is to like the person whos teaching you, you ahve to able to talk to them to improve. Also you need to know what you want to do while there, the teacher cant help you unless you tell them what you want to learn.