Hi!
We just got back from WDW and it was my first time to trade with CMs, or anyone else for that matter, in person. Cast members are SO wonderful to trade with. We found 40 different lanyard pins in a week. A WDW DAK CM showed me how to ask "May I see your pins please?" and to say "thank you very much" if there were no pins I was interested in. When trading I just told the CM which pin I wanted and which pin I was offering. They were just terrific!
I also had the wonderful experience of a CM taking a day to get the BIBITIBOBITBU license plate for me because we struck up a conversation and I said that I hadn't seen one all week. He told me to come back to the resort pin cart the next day...and there it was for me.
You will have so much fun. There are pins that are "turned around" and are "mystery pins". Think it gives the CMs some fun. One told me, when I asked, that it was a "mystery" pin..meaning I couldn't see it....and it was an Innertube Mickey. I almost started jumping up and down in the middle of the store.
So, have a great time. Don't worry...and hope you find the pins you want!
Judy