Verified clear. Fifteen slow reholsters under your winter coat. Clear the coat completely out of the way, look the gun into the holster, and keep your finger straight along the frame. Check for drawstrings, zipper pulls, and hems, because any of them can get into the trigger guard.
Fifteen rounds at 7 yards, three per string from concealment, with a slow and deliberate reholster after each string. Holster work only if your range allows it and you have been trained for it.
A jacket worn over a duty holster has the same hazards. Look before you holster.
Most self-inflicted gunshot wounds happen while reholstering. There is no reason to do it quickly.
Carbine version: apply the safety, check it, and only then let the rifle hang on the sling.
AUX (when ready): fifteen reholsters with the coat fully clear and your eyes on the holster every time.
There is never a reason to holster in a hurry.
You do everything quickly. This is the one thing you do slowly.
Look at the holster mouth every single time.
Reholstering usually happens at home. A mistake there lands on the people you live with.
Check your coats for cords and toggles once, and cut off the ones that hang near the holster.
Layer: run five reps with gloves on.
Dry-fire: no ammunition in the room. Verify the firearm is clear — twice. Use a safe backstop. When you finish, say it out loud: “Dry fire is over.”
Non-negotiable. Every drill, every rep, every time. This applies to live fire and dry fire.