Prepare by knowing info about the school and the department heads. Know about the profession and why you want to be a part of it. Review your personal statement and your article summary. Most of all it is super relaxed. They just want to get to know who you are and see if you and the program fit together. Good luck and remember to say hello when you are here. Oh and join the facebook group i created that answers all these questions. We have alot of people in the program that are willing to answer any of your questions. So ask to join.