Ditto what PT-111 said. (I carry one too).
I would like to add:
When practicing under simulated stress I found that OCCASIONALLY I would NOT get the gun off safety. Even though I quickly knew what had gone wrong when the trigger would not move, it still took me a couple of extra seconds to realize it, correct it, and fire.
I decided I might not always have extra time so I now carry my PT-111 (and other DA/DAO guns) with the safety off if they have one.
When I first started carrying, I carried with safety on because I was uncomfortable with it off. I am now completely comfortable carrying with the safety off. Just make sure the trigger guard is covered and that there is no way that trigger is coming back while in it's holster.