Hard to master ? Yea , well you might master it in some years but the basic come quickly along with improvements . HaThat's it. Pretty simple, but hard to master -- hard to convince yourself not to stage the trigger and wait for the sights to be perfect. You get so excited when the sights do cross the bulls eye, you develop a championship level flinch.
While your attempt to became a natural with a sweeping a trigger check out Flash Sight Picture style of shooting at least as far as defensive drills go but works for matches to but perhaps at shorter distance . THis was developded by ole Jeff Copper and still taught at Gunsite Academy and by others .
My eye sights not good any more , I wear trifocals and the sights are mostly burred bumps !! I can still place a group of 13 to 15 40sw on a uspsa carboard target sort of quickly ! All shoots in the A zone and might even cover the group with one hand , maybe both . Thats ok as your focus is really down range watching your threat os target in a match , You flash across your sights to check your point of " aim " is on the center of mass you want to hit not so much an aim point but really the slide with no sights can work too . Example - I have a cm9 next to me , it guards my computer . Pointed at a door 30feet away the slide covers close to 9 inches at that distance If rounds hit in the 4 inch wide area in the center . Now those pesky 6" round plates , That requires a red dot most days if there at 15+ yards .