Helios52 wrote:- The unwritten rule is generally the person with the lower References or is new to the site sends first...
I think this should be pointed out and highlighted as something that both parties should agree on before a trade is accepted. The Bad Trade forum is littered with cases where one person thought they were sending at the same time, the other person didn't, and everyone ended up angry.
I just checked although the trading rules don't specifically say so, the trading guidelines do: whoever has lower feedback sends first in the absence of an agreement to the contrary. I agree, though, that it never hurts to spell out exactly what one's expectations are.