Ah, grasshopper, you must become the shot. No thoughts about what is about to happen. No teasing the sights into alignment, no worries about missing, you must become the gun shooting, not a man shooting a gun. As Yagyu Munemori said, The heart [of the samurai] is like a mirror, empty and clear.’ Such is no-mindedness.
To attain this, you must practice dry firing at a target while holding the gun at arms length, daily - every day. If you are a long range silhouette shooter or hunter you must practice from the position(s) you will use. Sight picture, breath control, squeeze and follow through. Your muscles become stronger in the doing, they learn the task apart from mind, without thinking about what you are doing. It is like playing the flute, the music flows without thought, nothing is being done, it happens by itself; no fingers, no flute, no embouchure, no breath control, it is the music itself that is breathing. This is the result of practice and training.
A pistol is being held. It's sights align perfectly, there is a target but it is of no concern. BANG! Still the sights are aligned, the target ignored. Someone has fired. There is a hole in the x-ring - most satisfying. Now go practice.