Looked under mine this morning and realized that it is 4 bolts that are holding it on along with the plastic retaining clips that you cannot see. When I removed the assembly I recall it taking me less than 10 minutes to get the trim assembly off without breaking any of the clips, but I was also using a clip removal tool to slide in there and pull them lose. I cannot recall specifically, but I think that I added some small foam/rubber strips to areas of it because I noticed that it was rubbing the paint off the metal in some areas.
I did this four years ago so things are a little fuzzy now, but was surprised how rusted the four mounting bolts were so I wire brushed/acid stripped the rust off of them and put a clear coat back on them before putting back on the vehicle. I would have just purchased new ones at a hardware store, but I was down at my parents ranch on vacation at the time and the closest store was 50 miles away with no guarantee that they had the right ones.
Long story short, I seem to recall now that I did have a small bubbling spot in the paint near my emblem, in the corner possibly, that I stripped down and put touch up paint on that was a result of the plastic trim rubbing through the paint. Like you, that was what started my whole repair experience.