Usually, for trading, there is a driver party, and a rider party. Driver is the person who sees an item, and have interest in it, so he wants to contact the seller for trading. Since he wants to start this, he needs to send his trade-in item to the other party first (without payment) after settling down the detail such as 1:1, or some cash involved? etc. The rider party receives the item, inspects it, and decides trading or not. If not, return the item back to driver.
Basic trust, of course, is needed.
One way to tell a seller being fake or not is easy (fake seller defined as seller listing things not belong to him) -- Ask the seller to provide additional pictures of the item on specific areas. I have never met a fake seller who could provide pictures as requested, what they have are just those pictures copied from auction house catalog. Usually, if the person is the owner of an item, he won't cheat you by taking your trade-in item away -- genuine seller's purpose is selling his item, not cheating in a gun. That's the usual case. Even for fake sellers, their purpose is cheating in cash, not cheating in a gun.
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