Well, I got it apart and back together with only minor damage. Not to the pistol, to my laptop. As I was using a wrench to compress the recoil assembly, the grease caused the flange to slip off the wrench and launch the cap directly into my laptop screen

There is now a small blemish there to constantly remind me of my mistake

Getting back to the pistol, I got it apart, except for the right grip panel. I got the screws out fine, but could not get the panel itself off. I didn't want to pry it as I hate to scratch a brand new gun. Or any gun!
When I got the slide assembly apart, I saw things looked pretty dirty in there. So I swabbed the barrel with M Pro7 and cleaned the breechface. I also cleaned under the extractor and the groves in the slide that mate to the rails.
Then I regreased everything with TW-25B and reassembled. I called up the pictures here to make sure I got the spring on right, which is the mistake that caused the dent in the screen.
Apparently the pin is not tapered and I reinserted it with no trouble. Not a very difficult process at all, actualy. I just need to make sure I have a back stop next time.
I found the answer to my "safety intercept notch" question. When I had the R9 apart, I pushed the firing pin with a pen cap and saw it protrude through the other side. Apparently, there is no firing pin block of any type. Also, it seemed that the hammer sits right on the pin.
I also see that the hammer is recessed a bit below the slide, so in theory dropping the pistol on it's back, on to a flat surface, would not force the hammer forward. But if you drop it on to an uneven surface it is conceivable that the gun could discharge.
This is just a theory, and I have no plan to test it. I could be completely wrong. There may be a passive safety I just missed. I don't really know anything about the design of this pistol. I hope someone else who is knowledgeable about the design can address that.
If I'm really lucky I'll have a few minutes to shoot it Monday, assuming the weather holds. I'll report back after I do.