Permit out
Check every gun to make sure it is indeed safe
finger out of the trigger guard, never pointing it at anyone
I hand the gun back with the slide held open, or the cylinder open
If you have to put it down on the counter use the pads that are usually there. If no soft spots hand it back to the salesperson.
Great start...
I know where the firearm is pointed has been addressed. A lot of people seem to have a bad habit of rolling or turning the gun sideways to "check it out." They do this without even realizing that it may be pointing at the person standing right next to them or across the room. I have seen, more than a few times over the years at the shops. I have also seen individuals do this with a loaded firearm while on the range because of a malfunction or some other reason. I am sure others have experienced this as well.
Just be aware of it. Thanks for asking your questions. You are smart to do so.