At the disney parks, any Cast member will trade a pin they are wearing on their pin lanyard (pin necklace thing) for another Disney Pin. So it is a very low stress way to trade. Some other people will trade pins as well, but they may be more picky in what they are trading for. A good way to do it is to buy a lot (as in a set) of Disney pins off Ebay, and then pick a theme and trade your pins for the ones you want. Like maybe you want to collect Pooh pins or Stitch or princesses or ride pins or hotel pins or whatever. By buying them off ebay (make sure they are official disney pins), it is a lot cheaper.