When I started defensive shooting the instructor I went to was really big on point shooting. He'd always say "If you can point at something you can shoot it!" But here is a good way to get started:
Move the target out to 7 -10ft, the average distance of must attacks. Start with the gun at a low ready (standing up straight, feet shoulder width, Gun in at your chest, finger off the trigger along the slide) Then when ready extend the gun, bend your knee, lean into the gun, and point at your target. Once you're in a good shooting position and pointing at your target place your finger in the trigger guard and pull the trigger. Then finger off the trigger, return to a low ready, and repeat.
Start slow and safe. As you get more comfortable and making good hits you can increase the speed and start mixing in double, triple, ect.
If you can find a good instructor and get some one on one time that’s always the best.
You can also dry fire practice this at home. MAKE SURE THE GUN IS EMPTY. Go through the above steps but at the end close an eye and see if you actually hit were you were pointing.
Hope this helps and if you have any questions feel free to IM me.
"When Government fears the people, it's liberty. When people fear the Government, it's tyranny."
- Benjamin Franklin