Honestly Sandy I've only done two trades. so I'm not an expert.
One trade was for downloadable/printable item. We traded out digital downloadable/printable drawings. That was simple.
The second trade was for a ACEO card. She asked if I would trade as she wanted my ACEO card and I picked out one of her ACEO's that she had for sale. We kept the prices the same as they were and completed the check out just like any other sale, that was we still had a record of the transaction.
The ONLY difference in trades is, because no $$ is really ever being exchanged - you'll want to go into your payment terms and change your payment methods to include "OTHER" so that the person trading can purchase from you without actually submitting a payment during checkout.
As soon as the trade is over I immediately change my payment methods back to normal as I only accept paypal.
I took a peek at your shop and noticed that you sell actual item that are mailed, but yes we can trade. Pick which item(s) you like in my shop and let me know which of your items (that you're selling in your shop) you are willing to trade for. When a trade is decided, we go change the payment options to "Other", we both can check out using "OTHER" as the payment method. The trade is completed and we send/email each other the items.
I know it sounds difficult but it's no really. Here is a link to where ETSY takls about trading.
http://www.etsy.com/help/article/295?ref=help_search_resultLet me know what you think!!!
Love, Kathy