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Julie Vognaron a card or a set you are not familiar with, ask a friend who is familiar with it to look at it first. And whatever he says, ask him why.
Whenever possible, win things which are 100% returnable.
If you are at a show, run over to a knowledgable friend with the card (leaving half your worldly goods as security) and ask him, and whatever he says, ask why.
When given the choice between buying something at a show, or through the mail with return priveledges, and buying on ebay or from any auction, go with the thing you can touch, or the thing you can return.