Chamber a round, use the decocker lever to lower the hammer, flip the lever back up to take the safety off, and you are good to go, with a heavy double-action first trigger pull as a type of AD/ND precaution. Also, you can flip the safety lever down, then chamber a round, which will lower the hammer as the slide returns to battery.
Although the actual "safety" aspect of the safety/decocker may have use to someone, it doesn't for me. The only use I have for it on my 92FS is as a decocker. I swipe the lever down to safely decock the hammer, then immediately (and instinctively) swipe the lever back up to take the safety off. I then holster the gun.
My perfect Beretta would be a "G" model, which was offered for a few years. It's lever was "decock only" and automatically sprung back up into the fire position after decocking. There is no way to convert a standard model to a G model.
There is a Hickock45 video on youtube, where he shoots a Beretta 92FS, and he repeatedly loads the gun, decocks it, then puts it in the holster without taking the safety off. I cringe and yell at the computer screen, "take the safety off!", because he continually pulls the gun out of the holster, tries to fire, and then realizes he forgot to swipe the safety back off. This is very bad in a life or death situation.
You have to practice it until it becomes instinct. It's a much different system than almost all other handguns out there.