I figured it was bound to happen: Oh yeah, it's like so easy dude. Well, I've put my nifty tiny pry-bars under both of these several times and the suckers will not snap off. So when I read the E-how bit, the first one, made sense.
Like I said, I've seen other speaker grills on E30s that are easier than my style. They have an exposed screw on each corner.
I'm about to break one off so I can dissect its carcass.