I may be too late, as it's late Saturday, and your wiring may be finished by now, BUT: one thing that has saved my bacon several times is to put the room light switches far away from the fan/safelight switch.
In my darkroom the latter are by the door, but to turn on the lights I must reach high on the wall far away from every other switch in the darkroom. That way there will be no surprises by carelessly choosing the wrong switch. I saw this in Ansel's darkroom in Yosemite and was impressed enough to incorporate it in mine.
Choose a place on the wet side, as you usually turn on lights when your hands are wet with hypo or some other nasty drippy liquid.
Good luck with the darkroom. It's fun to build and much more fun when you use what you built.