Dropping the headliner isn't terribly difficult. You have to remove the visors, A pillar covers, center overhead console and dome light to drop it enough to put in cab lights. Everything is pretty self-explanatory. To remove the overhead console, pop off the clear light cover and there are two torx screws that hold it up. Wiring disconnects with a quick disconnect plug.
As for mounting switches, the overhead console comes molded with the support rings for switches already mounted. You'll see them when you remove it. Carling makes some very nice OEM style switches that pop right in. Very easy project with an X-Acto knife or Dremel. Just take your time.