Sorry for jumping in the arena so last, but I was up north camping with my daughter this weekend while the Mrs and son were school shopping. I still consider myself "newer" but joined a couple months ago and have been lucky enough successfully trade with several over of you great people. For the most part, I've initiated most trades and have only been turned down a couple times. Typically I try and find trade partners with a minimum of 5 matches. I've sent via small PWE(4-8 cards I think), or larger PWE(10-12 cards). Anything over that i will use a bubble mailer. So far, I haven't recently any issues as far as i know.
I try to keep it a minimum of 5 just as a balance for postage. It's little hard to justify the postage for 1-2 cards. Since I've been involved you all, I love the excitment of trading and anticipation of the cards i'm receiving!
~Shaun