I'll buy on the bay if I find a really good deal. I'm pretty good at spotting fakes and sniffin out nonsense and scams. If I were a novice I would follow this: ask for tagged pics from all angles (bottom of the shoes, top of them, insoles, inside tags with factory numbers and all, close-ups of midsoles, etc etc); take those pics and post them in the Legit Check Price Check Forum on NT and make sure they are legit if you don't have the knowledge or experience to make the judgment with confidence yourself. And whatever you do, DON'T pay outrageous prices for kicks. Chances are if you are patient you will find a pair at a good price, just gotta be patient. I actually just picked up a pair of DS Steel X's for $150 shipped the other day.
Also, I recommend reading through the Legit Check threads in the forum as much as possible to get your knowledge up and watch some videos on how to spot fakes of certain shoes from certain years and get a list of the tags and the factory and production line numbers. That is always a very good way to determine if kicks are fake or not.
Good luck.