When drawing from concealment, there are primarily two methods taught: two handed grab and one handed grab. The video below by cory07ink gives a great demonstration of both techniques.
In the video, Cory explains why he prefers the one handed grab over the two handed grab, but stresses that the main thing to do is practice your chosen technique.
Many of us don’t have a range where drawing and firing is allowed. If that’s you, how do you practice?
Then answer is you practice at home, dry firing only of course. The first and most important thing to do is make sure you properly clear your handgun. Drop the magazine, clear the chamber, visually and physically inspect the gun to make sure it’s empty. Empty the magazines you will be using for training. And remember, treat every gun as if it’s loaded.
You’re now ready to practice drawing from concealment, reloading, etc. Dry fire drills are a very effective way to become more proficient without using live ammunition and/or violating range rules.