SAWBONES,
RJ's StopStick helped me tremendously, both disassembly and reassembly.
I did ask my wife to help position the StopStick during reassembly.
The biggest problem I had was compressing the spring. I reluctantly used channel locks, per the instruction book.
Then, I could not get the slide to go back, so the pin could be reinserted. It was just inexperience during the initial effort.
I had to rack it real hard, and that opened things up so the StopStick could be inserted.
It wasn't much fun the first time, but should be just fine in the future.
One good idea is to place it in a vise, surrounded by protective leather, and proceed to work on it. RJ was kind enough to send some leather, upon request, along with my order.
My Kahr PM9 wasn't all that easy. I would bang on it with the plastic end of a screwdriver. And then, pry out the pin with a plastic orange peeler.
The R9S is a lot more fun to have, to look at, and carry.
Bill