Below is our kitchen ceiling. We installed the tin ceiling, lets say, 2 years ago, before the rest of the kitchen was installed. After the flooring, cabinets, counters, paint and trim were installed, we still had to install the crown molding. This, quite frankly, scared the heck outta me, since 1. I've neve installed molding and have no experience with mitering/coping, and 2. the molding is thin-thin-thin metal, meaning it the pieces don't join in a tight seam, it could look pretty poor. Oh and 3. Since it has to mate with the tin ceiling, if I don't get it flush you will see a gap and it will look crappy. So, for the last 16 months I have put it off. But a sudden burst of courage and I decided to take it on.
We purchased the cornice pieces at the same time we bought the ceiling pieces and thankfully did not destroy them during the past 2+ years. Armed with all the installation instructions I could find on the internet and a power-miter saw borrowed from old friends, I was equiped to do the job. Now, to see if I could actually do it.
And below you have section #1. Honestly can't believe how well it is coming out. Not claiming it's perfect, but over-all, quite happy with it so far.