Totally depends on who's doing the application. There's a few Krown shops in the Buffalo NY area now where we used to have to pop over the border to get it done. I didn't care for the job the one closest to me did on my 2017 Ram 1500 a few years ago, so I've been doing it myself with Fluid Film and Woolwax ever since.
Pulling the rear fender liners would be a great idea because they won't do this for you.
I do believe they'll pull the taillights. Just make sure all the screws are there before you leave. I'm 90% sure they lost one on me.
In terms of hole drilling. All they did on mine was drill one hole per door, below the latch opening IIRC. Totally unnecessary. There's two cavities to the rocker panels. Inner and outer. They didn't pull the body plugs and do the outer that I know of.
Canada Krown shops seem to be awesome. I thought that was about as routine as oil changes for you guys!