After reading several posts here: I ponder.............
I seem to recall that there are these laminated and folded pieces of paper in the flightdeck. I think these "checklists" mention the position of numerous switches PRIOR to engaging your brain, not to mention your giddy little fingers. When all else fails or whilst interrupted during the completion of a checklist, start over from the beginning(after you have told the interruption to GO AWAY).