When you have selected your handler, work closely with them. Listen to their counsel about diet, conditioning, grooming, and show scheduling. You are paying for his expertise, so use it. By the same token, you are the client. If you are not satisfied with your dog's progress, condition, or the handler, do not hesitate to tell him about it.
Most handlers welcome input.
Always remember that this is a three way partnership between you, your dog, and the handler. And all three parties need to work together to achieve the success that you want.