Hello,
I have been to several over the years. There are LOTS of traders there. And thus, LOTS of pins. It will seem quite intimidating at first. But as you gain knowledge of pins you will feel more comfortable trading with other guests.
CM's will be on hand with lanyards as well. And they will usually have a table with upcoming pins to look at. And sometimes they will release a special pin on these nights.
So go, have fun, and trade! Just a bit of advice, if you are unsure or don't feel comfortable about a trade offer, then just simply say no thank you and walk away. The majority of pin traders are quite nice. The few that aren't so much, well, just don't label all pin traders together based on a few bad apples.
Blessings,
Winnie