No real need to use snap caps, but they won't hurt anything. The one big no-no is to let the slide slam forward on an empty chamber....that's what really kills trigger jobs as it beats the heck out of the sear and hammer hooks. Oh, and when you take the gun apart for cleaning, don't pull the trigger/drop the hammer when the slide is off the frame as that can ruin the hammer.
I have seen it snap the hammer in half. Not a good thing.