Training someone to shoot a defensive handgun is mostly a standardized process. Firearm safety is followed by firearm function, which is then followed by an introduction to the basics of marksmanship. Past that, focus falls on handgun manipulation, presentation and various methods of target engagement.
Having all the newest gear can definitely an advantage, but not if you haven't first mastered the basics of defensive handgun training. Sheriff Jim Wilson talks about the fundamental skills for shooting a handgun well.
In his various writings, Col. Jeff Cooper admonished his students and readers to live with their defense gun.