I always exit my vehicle with a tactical roll and jump to a standing position. Any eating establishment or saloon, I never sit with my back toward the entrance, and I scan each person who enters and give them a steely eyed glare. This will elicit twitching or rapid avoidance of eye contact from outlaws.
When I enter an unfamiliar location, I come in sideways with my weak side facing in, my strong side hand on my (drop-leg) holster palm in touching the pistol grip. I carry a FN 5.7 pistol and at least 5 extra mags in a pouch.
I think civilians should be required to take tactical training before being allowed the privilege of owning and carrying a handgun.
EDIT TO ADD: For those that don't get my wry, understated humor or rapier sharp wit...the above was not entirely serious. No insult intended to the original question which is very legitimate. Just trying to poke a little fun at some of the self appointed "tacticool" advice you sometimes see in the gun magazines and forums.
![Wink ;-)](./images/smilies/icon_wink.gif)