Welcome to the forum. I take it this is your first revolver.
Smith & Wesson revolvers up to about the early 2000's had a firing pin integral with the hammer and the hammer/pin (more correctly known as the hammer nose) assembly strikes the primer when released by the trigger. Those same revolvers have had (since just before the end of WW2) a hammer block safety that automatically interferes with the hammer's travel and keeps the firing pin from touching the primer under it when the trigger is released to reset after firing. As the trigger is pulled the hammer block drops out of the way to allow the hammer to fall all the way to the primer then as the hammer retracts while the trigger is reset the block rises and blocks the hammer again. It makes more sense to see this in action than to describe it.
S&Ws made after the turn of the 21st century have a firing pin housed in the frame and separate from the hammer. The firing pin has a firing pin spring to retract it when the hammer moves back during trigger reset. Other than that, the hammer block safety works exactly the same way.
What all this means is that you do not need to carry a S&W revolver with an empty chamber under the hammer beause the firing pin is never in contact with the primer when the trigger is at rest. You also d not have to worry about dropping your pistol and having it fire because it falls on its hammer. The hammer block will make sure that doesn't happen.
The only time a properly functioning S&W revolver will fire is when you pull the trigger all the way through its stroke. If you buy an inside the waist holster that covers the trigger, and make sure that nothing gets in the way of the trigger while reholstering, you will never have a thing to worry about. Those precautions are universal when reholstering ANY gun, anyway. In any case, if you load a revolver with an empty chamber under the hammer then you pull the trigger expecting a click, you will be startled with a loud bang as the cylinder rotates during the trigger stroke then locks up into battery bringing up a fresh cartridge just before the hammer falls.
I will say one last thing. If you do not feel comfortable carrying a pistol without a loaded chamber, then don't carry at all. That goes double for a revolver since your ammo capacity is already limited. Giving up 17% of your ammo due to an irrational fear is not a good thing.
