One answer to the original question, 15 years ago, I was reflecting. I had nice guns , a good truck devoted to bird hunting, reasonable trained bird dogs, and spent a lot to travel to nice public lands far away. I missed way to much!!!!
I went to a shooting school hosted by Gil Ash, and spent more money, very wise decision. To overcome my left eye dominance, and voodoo measures . He showed me my brain could overcome my faults, and I am a better shot now.I will never be a competitor, but I do understand the proper foot placement, stance, gun mount, eye focus, and stock fit. When I miss which is still too often, I know why. A serious shooting school can make a world of difference! Consider what you spend overall, it may not be that much money. Brian beliniski in traverse city Michigan is an excellent teacher too.