Be more concerned about your impression of them
than their impression of you. Are you comfortable?
When you meet someone it only takes a few minutes
to determine if you are comfortable in their presence .
Do you have anything to talk about ? Are you attracted
to the man in any way ? Is he smart enough to be engaging?
Is he sarcastic ? Do you sense anger below the surface ?
Does he get irritated easily and seem controlling ?
Does he appear mentally stable ? Is he appropriately open
but not spilling his guts on first meeting. Is he an "advice giver"
so his entire converstation is giving you advice ? Is he shifty,
and secretive ? Does he start talking about sex in the first
30 minutes of meeting him ? Or bad mouthing his ex ?
Or talking about drugs. Is he open about where he works,
lives and what his home phone is ? (Or if he works)
Does he have good personal hygiene?
Did he get there on a skateboard ?
You don't have to "do" anything. Its an interview and
your conducting it. Your not there to "please" him, but
to evaluate whether this is a person you might consider
as a friend. Basically this person has to work as someone
you like and someone you trust, and someone you respect.