If you want the job, go in there with ONLY the thoughts I REALLY WANT THIS JOB, I REALLY AM RIGHT FOR THIS JOB, and FAKE IT TIL YOU MAKE IT.
"I really want this job" reflects your true feelings, before the "buts" move in. Don't let the "buts" move in!
"I really am right for this job" reflects the facts about your qualifications--no evaluation needed.
"Fake it til you make it" reflects the fact that in the doing, you WILL make it. You'll be thinking you're faking it, but because you can do the job, and are doing the job, you're making it!
How do I know this? Take it from a seasoned self-saboteur, who messed up multiple opportunities, including my dream job and graduate school at NYU, because I felt like I wasn't good enough, but wound up breaking through and "making it" (at least doing pretty well) at the ripe age of 46.
Go for it!! Good luck!!!! Don't analyze yourself, and don't judge yourself, and tell yourself that your HP put you on this earth to do this!