Re: Self Spotting
Following through, that's to say, controlling the rifle until recoil subsides, will give you recognition of your sight's relationship with the target as the bullet clears the bore; thus, you'll know where the bullet strike should be. Plotting the location of the suspected hit is known as "calling-the-shot".
Calling your shots is essential to becoming a good shot. It will help you to trouble-shoot (get to the source of the problem) when shots do not go where desired. For example, a shot not on-call could mean the sight needs to be adjusted, and/or wind not correctly countered. A shot on-call, but not "right-in-there" may say something about not adjusting NPA.
Shooters who are ignorant about the necessity for following-through will have an ordeal just attempting to zero a gun; plus, chasing spotters from non-existent wind is highly probable. Of course, failure to follow-through is likely to result in the rifle pointed in a very different direction than where needed for a good hit, since the brain, believing the job is done upon trigger pull, allows muscles to relax before the bullet has actually left the bore.
There's not much to learning how to follow-through, just maintain aim until recoil subsides. You only need to will it to happen, that's to say, tell your brain you want to continue to aim, even though having executed the firing task.