Yes, in part. And in part it is simply remembering that a weapon is dangerous, and not allowing yourself to engage in risky behavior simply because you have grown complacent.

[Discipline. Practice. Routine. A number of words both solid and often considered to be boring that he had pinned his life upon.]

And then there is simply developing the stamina and strength to hold and fire a weapon. You appear to lack that. [It is almost a laughable statement coming from someone as large as him, directed to someone as slight. 'Appear' may have been an understatement.] Strengthen your muscles and it will improve your accuracy.