Coastie,
I have a significant number of firearms. In round numbers, I carry/shoot maybe 10% of the handguns I own, the rest are investments. Not my only investmentments, but a lot more fun than my real estate, Roth or 401k (especially lately!).
I attend gun shows, primarily to add to my collectibles. I do A LOT of research on any weapon for which I am, at that time, in heat. I use the resources already mentioned in this thread as tools for said research, so I'm hip to the market before I shop, and I shop with cash in hand.
That said, I am always ok with a bargain but the kind of guns I buy are pricey even if the cost is lower than anticipated. So, I don't go to find bargains, my goal is to find the piece I desire to fill the hole in my collection. The dealers with whom I custom know me and what I like,often holding back something "special" they know I will like.
So, I deal with folks who are known quantities. The only way to do that is to jump in, observe, learn, and, when the time comes make your buy in such a manner that it appears that it's not your first rodeo - because, by that time, it isn't.
So, know what you want, what it's worth/what you'll pay, know the seller, and, for face to face deals, know what your legal requirements are.
You aren't comfortable with the repartee of whachagot/how much? that is common at the show, but you need to get that way to achieve your goals. Get comfortable with negotiation, inspect offered items with honest, informed questions. Carry a bore light and silicon cloth with you. After you inspect the gun, no matter if it's buy or pass, wipe your hand grease off before you return the weapon to the seller's hand.
Joking comeraderie combined with demonstrated respect will plant good seeds with the current seller and those observing you manner-- you may be dealing with them next. Always find some aspect of that weapon you can complement the owner on. If the deal doesn't go, you've left a good taste for next time.
FWIW,
MWM