That'd be the thread, but you should also read up elsewhere online about how it works, and the differences between BCH and BTC.
Should be "safe" as long as you use Armory to split and make sure you sign with the BCH signer. Do not expose your private keys.
Thanks! I will try to read as much as I can as well as posting in that thread instead. When I say I'm a newbie, I literally mean I don't know anything about this stuff. As I said I've had bitcoins in an armory wallet for a couple of years, and I know how to send my bitcoins and how to restore my wallet from my paper backup. That's it. I have no idea what a "signer" is (but I read in the other thread that I need to use the BCH signer) and I barely know what my private keys are (and thus, have no idea how to expose or not expose my private keys). Thanks for your help, I will try to read up a little bit more