I do pretty well with handguns & shotguns.....I'm not so great with a rifle, esp. one with open sights. That is, unless I am shooting at a moving target....then I manage to somehow hit it most of the time!
I think part of that comes from shooting at so many clay pigeons over the years; it sort of becomes 'instinctual' to keep the barrel moving until it gets ahead of the target.
I must also add that I was fortunate to grow up in a society that wasn't full of whiny panty waist types.....we made our own slingshots and bows and arrows as kids (something that if done today would probably get you a stint in juvie), and....worse still....we actually
shot them at birds, frogs, ect. A lot of the basics, such as hold, follow through, breathing control, windage, ect. were learned on those forked sticks and inner tubes.
I also think that there is a bit of 'talent' in using a firearm well, just like a musical instrument......I can teach someone how to aim, squeeze the trigger, breath properly, ect., just like I can teach someone notes on a page and which string corresponds to which note, ect., but there are going to be those that can just barely plunk out a tune (or barely hit a target) and then there are those that after a few lessons just seem to be able to play anything after hearing it once (and those who seem to hit targets at impossible ranges or angles).