You really need to practice your draw stroke, from concealment, and do it often. It is, perhaps, the most essential skill related to the defensive handgun. However, there are a number of variations on this draw stroke, and I am referring here only to the draw from a single carry mode. Even if you wear your gun in the same place, with the same holster, all the time, there are at least several variations on the draw that are necessary to ensure you can deploy the gun under any circumstance. Regarding drawing the gun from a primary carry location on the waistband, strong side or appendix, there are at least four variations:
1-The Default Draw: this is the go-to option that you perform when conditions are ideal. It is the draw that you perform when going for maximum speed on the range. For most shooters this draw involves clearing the cover garment with your support hand, though some shooters use only a single hand to lift or sweep a garment from a strong-side carried gun.
2-Single-Handed Draw: You may need to access your handgun with a single hand if you are injured, carrying a child, or for any other reason that sees your support hand detained. If your default draw utilizes both hands to clear the garment, you must practice a technique so that you can deploy the gun with only a single hand.
3-Support-Hand Draw: What if your dominant hand is injured or detained? Can you deploy the gun with only your support hand? This skill should be developed under the tutelage of a good instructor and then it should be well-practiced with dry fire before doing it with a loaded gun. While inconvenient to practice, this is an essential skill.
4-Surreptitious Draw: There are times when people have needed to access their weapon without hostile entities seeing the movement. If in a position to get the gun in hand and out of the holster before a threat notices, you should have a well practice surreptitious draw.
So there you have it. I believe there are at least four variations on the critical draw stroke and all demand some practice.