Questions about adding vanity lights & moving switches in bathrooms

I do not intend to run the wiring myself- I plan to get a professional to do it, but I want to make sure it's being done right and I am curious about what would work, what's to code, and so forth.

I've mentioned this before but recent electrical discussion has me curious. None of our bathrooms have vanity lights currently and I would like to add vanity lights to two of the bathrooms. I will use LED bulbs in them to reduce power usage (I also like that LEDs can be very bright). Both...

Questions about adding vanity lights & moving switches in bathrooms