One important aspect to consider when choosing a golf instructor is what your goals are or what the state of your game is.
Golf instructors have grown in numbers over the last twenty years, and many specialize in different areas of the game. Beginner golfers can benefit from most all PGA professionals.
On the other hand, a top junior , amateur or even an aspiring professional might want to seek help from a PGA professional who has proven success working with others with same goals or competes regularly themselves.
Another is some coaches teach a certain “method” and this method may require the student to spend several months grinding on the range. And if you do not have the time, it may not work too well.
All in all, it is a journey. Most golfers can learn a little something from all pros.