I have an interview for an internship at a private investigator firm next week, please help!

I'm terrified. I had literally been cold calling private firms for the past 3 days hoping for some luck. I thought I was wasting my time (and theirs), until I actually got a response. I believe I would be their first intern if I land this. This is extremely important to me because I plan to go into the FBI and this would look fantastic on my resume. It's the most important interview of my life so far. That being said, I'm a ball of emotions. Literally any advice would be helpful. I'll take all the help I can get, blowing this would be devastating. Thank you in advance!

usa jobs
usa jobs resume
usa hotel jobs
usajobs
usa jobs federal government
usa job in ksa
usa jobs
usa jobs login
usa jobs gov
usajobs.gov
www.usajobs.gov
usajobs.com
usajobs
usajobs.gov official