Be careful... very careful ...
Here is a tip:
I do a lot of face to face transactions. I will meet local buyers physically in a coffee shop.
They hand over cash, I count it. I then send the coins to their wallet via my laptop.
I then show them the transaction id.
I pocket the cash. I walk away.
The wonderful advantage of this method is this: it is not reversible! :-)
For large amounts I take a special pen and portable UV light to mark and check the cash for fakes. (You never know).
This is a much safer way of trading than most people realise.
Very good, and very helpful pointers.
I don't have a portable UV light.
Can you suggest one?