You're gonna be fine, try to focus on staying calm and it will all turn out great. Be formal and smile, trying to mimic the movements of the person who is interviewing you is also a good idea. If you have to say your qualities and deffects, say your qualities first so it will stick better to your interviewer's mind. Try to know as much as you can from the company before the interview, it'll show your interest, and be prepared for the typical "why do you want to work with us" question. I dunno if I was much of a help but I hope you get the position you want, good luck :D