Tamara Keel says that if you carry a gun, you should get into the habit of carrying it all the time:
[…] It’s a safety thing, too. If you just put the gun on in the morning and leave it there all day, it eliminates a lot of unnecessary administrative gun-handling, and as anybody who’s ever looked around the walls of the sally ports, locker rooms, and restrooms of the local cop shop can tell you, unnecessary administrative gun handling is when most of the unnecessary loud noises happen.