How Credentialed is the Doctor
A good doctor is well certified, has years of expertise and experience in the industry and is fairly known. S/he would have great reviews. Is the doctor certified? Is the doctor well listed in well-known sources? Ask these questions before deciding if it is okay for you to go with the doctor's advices.
Looking at the review sites can help you narrow down on many choices, you can even ask your friends and family members if they have any references.
There are a good number of doctors who claim to offer superior services, but you should compare them based on recommendations, some doctors even have their websites; where they publish their blogs and pages on services and achievements. You can visit the websites to learn more about a doctor.