MegsAnn
I have found it is better to go with 6 yards just to be safe-especially once you wash and cut the selvage off..sometimes it is easy to get 4 f8s from a half yard and other times I have found I can get 3 comfortably so that would take 6 yards.
Hope this helps. I think you will have an awesome time in this swap-everyone here loves to laugh and have a good time and be friends :-)
MJ...you know leaving those nose prints is no fun for DH to clean!! But I know he loves going to the mailbox for you so a fair trade off I think lol
Hugs
April