Get yourself a $10 red laser pen, and practice point-and-shoot, anywhere. I do it several times a day, and when I go to the range, people (and I) are amazed at how quick and accurate I’ve become. The 3-point Weaver Stance isn’t necessary at 8-20ft. (Also, gives the cats some fun.) LOL.
I usually lay in bed and aim the weapon quickly toward the door. Holding the final position, I move my head/eyes to see where it lined up. Works fine....I usually get multiple head shots at the range for 20 feet.