"The point of carrying a weapon for self defense is it’s there when it’s needed. Predicting exactly what will be happening when that need arises is nearly impossible. If one could predict every dire situation, one could then avoid them. Almost by definition the defensive situation a CCW holder might face will be a surprise, and come on rapidly. If it were any other case then it would probably be better to escape than fight."Carteach0 has an excellent post up regarding defensive shooting. I am fortunate to have access to a private range where I can shoot as I like (as long as it's in the right direction). Being able to draw and shoot accurately at close range while moving, at a moving target, is a fundamental skill of the well prepared armed citizen. Ask around. Get to know your Range Officers. Seek out professional instruction. Chances are, there is some place near by that responsible gun owners in the know go to to practice reality based defensive shooting. Being able to put all the elements of defensive shooting together in rapid succession is essential to building overall competence.
But if such a place is unavailable to you, and if your range has rules prohibiting holster draws and movement, there are still techniques you can try. At the very least you can shoot from low ready while shifting your weight from side to side at targets as close as possible. Ask if you can staple two targets at different heights on the same frame. If permission is given, practice transitioning from one target to the other between shots. If even these practices are prohibited, then working with dry fire in the home remains an alternative, although the feedback of holes in targets is largely absent. For defensive training anything is better than aimlessly punching holes in paper in a frozen Isosceles stance.