The US Department of Labor states:
"Electricians usually start their work by reading blueprints. Blueprints are technical diagrams that show the locations of circuits, outlets, load centers, panel boards, and other equipment."
If you don't have any blueprints handy we've found that post-it notes with the explicit wording such as "Light Switch" work well.
And there was light...which made the whole kitchen seem bigger, brighter & cleaner!