It may be our mission, to achieve our overall vision, but what is that overall vision ?
Some would conclude that it is to live an honest and God - fearing life, so that we can avoid going down the wrong path and falling into strife.
The mission should always consist of a set of strategies, so as to achieve your particular set goals and objectives, one may use Key Performance Indicators, so as to evaluate, the plan of actions and strategic plans, that will eventuate.
Such plans should direct you on the path to achieve your individual mission, which after all, is aimed at achieving your initial overall vision.