I've been offered a few trades on something I have posted for sale and it got me curious as to how to handle a trade if I did want to go through with one. As in a buying situation, the buyer almost always sends the payment first and the seller waits to receive it/for it to clear before shipping out the goods. So it there any 'proper way' to handle a trade? Is it just up to whatever the parties agree on? Or is it the norm for one or the other to send the item first? Ship out both at the same time? Any info would be appreciated.