Well, I took it all the way down to itty bitty parts today. Thanks to WKC for the synopsis of the firing pin sequence. It really helped and you do need three hands and a right angle monkey wrench to pull the safety and get the pin out.
It was not too bad to pull the frame apart and put back together again. No left over pieces either.
It was pretty cruddy inside the FP housing. Not nasty but everything was brown and gooey. I scrubbed it and wiped until it was clean. I may still pull it apart soon and spray some cleaner in there or soak it as I'm concerned that the brown color was from corrosion and not burned powder & cleaner combined with grease/oil. Ain't paranoia wunnerful?
The sear and trigger stuff looked smooth but not polished. I greased it up and it's better but still moderately awful feeling. Not so gritty but.... I'll probably send it in for a trigger job. Some day anyway.
Anyway, thanks again to WKC for the assistance.