HELP Talking to professor?

<p>Tomorrow, I will be meeting a professor (prestigious organization) to discuss research opportunities for the first time. Any advice?
Should I try to be friendly or very formal (especially because I'm just a high school student, I don't want to seem to tryhard) ? It's my first time doing anything like this, so any words of advice will be appreciated! :)</p>

<p>(please no, "how did you manage to get an appointment?" kind of thing)</p>

<p>I'm kind of new to College Confidential, so please don't harass me if plenty of other similar threads exists. (I'm searching for those right now! haha)</p>