Your stance may change depending on circumstances, but practicing drawing your gun from a variety of positions will make sure you’re ready no matter when you may need to draw. (Currently, I’m doing a lot of drawing from the seated position.) Your grip, however, should remain consistent. You may be able to shoot with both hands, but something could be preventing you from using one of your hands. Always practice accessing your gun with both your right and left hand, just in case, and practice your one-handed trigger pull as well.