Hey, you're not alone. I have tried rigging on the side opposite to my normal way and its a real brain teaser. Also, I find using different mast extensions (Chinook versus Streamline Quick 6) that require different threading orientations does the same kind of spin number to my brain.
However, just curious, why couldn't you just rig the sail on your normal side? I'm aware that sail specifications are usually printed only on one side of the sail, but I'm not clear why one side of the sail is any different from the opposite side, at least with my sails.