I Need to Vent

So, this Thursday I have a job interview for this admin position. The thing is, I had the same job as a part-time job all through university and when I graduated, I was offered a job in the same department. Now, the entire department knows about my interview and everyone is trying to give me tips to impress. I'm really worried because of that. I will let everyone down including the director if I don't do well. That pressure alone is giving me a stomachache.