[JasminBerkova]

I would say that obviously, you should ask around if you can. References are always preferred. Basically do what you can to make sure he/she is a reputable instructor. After that, I would make sure that it's someone that you can work with. For me, when dealing with something that's fairly personal in a golf swing, it's important that you build a good relationship with your instructor. I have to trust that the person I'm working with wouldn't steer me in the wrong direction. I know that's fairly vague, but I hope that you get the point I'm trying to make here.