I have bought and sold several times FTF. Typically, the buyer here in Texas volunteers their CHL. I do take some precautions, such as meeting in a public place away from my home or theirs. I also ask for a description of their car. I get there early to see them drive up. If I get an uneasy feeling, I drive away.
I have sold a couple this way, and both times the buyer was cordial & clean cut. I have also sold at gunshows. A few months back, I was walking through the isle w/ a nagant carbine I paid $60 for 5 years ago. A guy at a table is waiving a $100 bill at me & pointing @ the nagant. Sold. I hand the rifle over the table, he hands me the $100. No papers, no permission from uncle sam required.
Freedom, dear friends, is a beautiful thing.