For people who are nervous, just try to enjoy yourself. If you look and sound positive and happy then it will probably come off better. I was super nervous but just tried to enjoy it. My interview was yesterday at 2:15.
Also, if you have a not so good interview, forget about it for your next interview. I was much less confident at my first interview but KCL was my second and I just tried to be confident and enjoy it - this worked much better than the whole being nervous thing did. Hahaha!
Good luck to everyone!