Correct me if I'm wrong, but the gun you plan on carrying is the Security 9 you mentioned in another thread?
If that's correct, the pistol has a number of safety feature's including a manual safety, and a hammer block. Doesn't get much safer than that. I understand your desire to get used to carry before moving to one in the chamber, but by doing so you'll have to "unlearn" what you got used to (draw, rack, flip safety off, then pull the trigger) when you do make the transition to one up, safety off. Every extra thought process and motion adds to your reaction time and is a potential point of failure. In an assault, you might have 3 to 4 seconds to draw and start throwing lead if you're lucky. If you aren't lucky you might have 2 seconds or less. Even with one up safety off, not many people can draw and shoot in under 2 sec and those that can, practice a lot. Often every day, or at least once a week. You don't need to expend ammo for that kind of practice. As has been said many times: Train & practice how you'll fight, and fight how you've trained and practiced.
A final note: Range and polite society rules don't apply on the street, or in your house, when you're looking at the face of death.