When helping new shooters grasp this concept I always start them with my Ruger 22/45 which virtually eliminates blast and minimizes recoil. My intent is to eliminate as many distractions as possible so their mind can concentrate on the front sight. Once they are comfortable I'll add a paper target to the mix and have them do the same thing then try to call the shot as well.
With each additional task the mind is having to do more so this takes a while. It's not unusual to burn through a couple hundred rounds of .22 working through these drills. Any time the shooter is showing fatigue we take a break or call it a day. Once your brain is tired you won't keep learning well and can reinforce bad habits.