Oh no, my anxiety is showing!

I know what I want to do, career wise. This is no problem. However, telling a possible employer about what I want (as well as how I’m qualified for the job) and making it sound like a casual conversation is incredibly difficult.

So, I guess what I would like to know is how you guys deal with the anxiety that comes with having a job interview and doing a two-minute pitch. How do you sell yourself?