BamUmp
From the for what it's worth department, here is the recommended grip by Jerry Miculek, but what does, he know?
A high and very firm grip is required.
Since the X42s and revolvers in general are not as fussy about what you put through them I would try a couple of the least expensive brands for practice until you find something you favor. Winchester White Box, Remington 130 gr 38 spl, Independence, etc.
Don't forget after you get halfway comfortable make part of your practice regime practicing with your carry load(s). This is expensive but necessary, since they may have slightly different characteristics. Especially if you start with standard pressure .38 spl for practice and then load
plus P for EDC.
I still favor Speer GDFSB and I have qualified COR BON and Buffalo Bore. I have some new Hornady CD but haven't practiced with it yet.
Hopefully you have been dry firing to begin smoothing out and wearing in the operational components.
I typically shoot from 7-8 yards. You may want to warm up with something closer. It certainly doesn't hurt to know where things will land at 10 feet.
http://www.google.com/search?source...=shooting+a+snub+nose&aq=0&oq=shooting+a+snub
Practice with the "man sized" B-27 Economy targets as you aren't going for bullseyes 9s, 8s are totally acceptable, you are looking to cease a life threatening act, not shoot out an eye. Center of mass in a pie plate size area.
You may want to peruse some of these articles above for suggestions.
Now go out there and get her dirty.