In any business, customer service is just as important, and in some cases more important, than the quality of your product. I have seen mediocre photographers with very successful businesses because the proprietor was outgoing and knew how to interact with their clientele. On the other hand I have seen very good photographers who struggled with business because they were not “charming” enough. Even when dealing with a “difficult” client it is important to remain calm, polite and maintain the flow of communication.