Please, don't be scared. Nerves are natural, but try not to let them get the better of you. Be smart, be professional and be yourself. And please, make sure you're on time.
As well as answering questions, make sure you ask them. And if you don't understand a question, say so. Remember to sell yourself: tell us about your strengths (and weaknesses), what you've accomplished and what you're proud of. And bring along a copy of your current CV - the one we have on file might be an old one.
From all of us here at Claire's, good luck.