I worry about this very little when trading with INGOers.
Any seasoned INGO trader with a good itrader rating and post history will lead you in the right direction.
Same, Any public place is fine with me. I don't abandon my spidey-sense or situational awareness, but generally my concern is low.
On a related side note, communication is important to a happy trade.
After the deal is agreed to via PM, one party or the other needs to send their number and request a txt confirmation. Typically the txt confirmation is replied to with the vehicle description to be looking for at the meet.
If you're on Indy's south side, Atkinson Guns will allow your FTF inside the store - just sayin'.