That's why we're here, Barb -- to help one another out. Doing so is never a pain in the neck, LOL! One advantage of this message board system is that one can search ALL the boards at one time. So people searching for your William MacPHERSON and Flora MacKENZIE will find them.
However, by posting on the most promising lists and boards, you up your chances of folks finding them who are not actively searching -- perhaps concentrating on another line right now.
Best of luck in your research,