X2 on what Dr. P said. I used a realtor that we were referred to by friend who was very happy with his performance on her home purchase. The guy totally knocked it out of the park.
Ask around a little. When you hear the same name mentioned a few times as "great", "awesome" etc., go with that one. When you hear horror stories of protracted (months long) closing, missing paperwork, or the myriad other stories of terrible experience- cross them off the list.