...what the hell do you do when you have an interview got on the basis of pretending you're really into something, googling extensively and you're not really?

it's next tuesday. i don't know the first thing about the topic.

top tips for interviews, dress wise? it's a writing job type thing so i can't dress too stiffly but i don't want to look casual

how do you relax? is having a drink beforehand a terrible idea?