There is an area in DTD where serious traders hang out and will trade with you....sadly some of them are not ..shall we say..'honest' when it comes to trading and I have seen (and therefore stopped) a couple of them from taking advantage of a kid....(
) for the most part I think it is fun to trade with the CMs as well as with other collectors in the parks. I believe there is a "code"...if you are wearing a lanyard=you are willing to trade...I have made some great trades just by asking someone if they would be willing to trade off their lanyard while I am waiting in a line.
Also, at the pin cart located in every resort there is a book to trade out of--just ask the CM who is running the cart where it is.....
Disney also has an event every year dedicated to pins it is usually in the fall....we went once and had a blast!
And if you want to keep on top of the worth of your pins, I suggest getting the Tomart Guide.
I am always available via PM to answer any questions you might have as well!
I have been collecting Disney pins for over 30 years and will do my best to help!