I’m going to echo what @dpierson83 said. You have to find someone you gel with. When I decided in my coach, it was kind of a fluke thing. I know what my goal is, but wasn’t ready to take my goals to a coach yet. I was going to use YouTube and all of those things to make me “better” and not embarrass myself in front of the golf instructor. The thing is, none of that stuff was helping because I didn’t understand golf enough, being brand new to it. Well I happened to be complaining about the pro at the course because he came out and yelled at our group for slow play, but it wasn’t us that was slow playing, it was the group ahead of us. Apparently the group behind us called in the complaint. Anyway, I was ranting and raving about him being unprofessional, and how much money I spend at that course, (I usually get lunch there daily because it’s right by my work). Anyway I mentioned my goals and he said well when you’re ready here’s my number. Something told me it was meant to be. I called him up a couple of days later and we’ve been working together now for two years. He is not only my coach but a dear friend. We get each other and he wants to see me succeed as much as I want to. It’s a success for him too.
Long story short, you might have to go through a couple of people until you find the perfect fit, but if you’re looking for years of lessons and not just a dozen or so, it behooves you to find the person that you mesh best with. I got lucky finding him in the first try. I still think sometimes I would like to go to a different instructor every now and then for just a couple hours, just to hear a different perspective, but I definitely won’t replace my coach.