Welcome to the forum Giraffes.
And I'm sure you will feel that your R9 purchase will be one the finest self defense purchases that you have ever made.
As far as tools and such. If you consider yourself a "gun person", by that , I mean one who has been around guns for a while and has broken them down and cleaned them regularly and such.
If so, you may not need the R9 break down tools at all. Takedown is not a difficult as some make it out to be.
On the other hand, if you are not really "into" taking guns apart and just don't really understand the workings then I would reccomend the takedown tools. And to add - if you just want to make it an easier job for take down, regardless of your ability, the tools do make it easier and quicker.
Having said all of that, I would get three tools -
From the classifieds - From David S - the "push-down" tool.
From the classifieds - From Yankee2500- "the takedown tool".
Then a quality allen driver from:
Brownells
Wiha
Bondus
for removing the grips.
For the low price of the grip screws from yankee compared to frustration of stripping out a screw or two - buy new screws.
One other thing, if you are going to pocket carry, by all means by a good quality pocket holster like a Meco. It's money well spent.
Since you have been lurking, I know you have seen links for everything I have mentioned.
Good Luck