Oh great , you're like me and actually *care* about how well you do. It's such a bad habit! And since I made it through university without too many scars, you will too! Have fun with it.
Good luck, don't worry about it... if you are the client go with some sort of real experience... that really gives some perspective on what people feel when they go to the first interviews... if you are the therapist then there are lots of guidelines you can rely on...