I don't get the first chart. The chart above is very accurate though. Learn to control your trigger finger, learn not to flinch, and focus on the front sight. At this point you can shoot. If the gun doesn't group in the center, change the sights. If you can't do those three things well don't worry about finger placement etc.
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I'm pretty sure that most would suggest having somebody else shoot it, before changing the sights, though.