It is a rare event when I shoot with a two handed grip. Most times my shooting is quick with one hand only. I do that practice at to about 20 yards. I can keep them inside the 8 ring shooting pretty darn fast from the holster. It is a combination of trial and error with proven ways, and what works for you.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.