The work of ministry is not just for those are called to it full time. All born again Christians are called to be the light of the world, and we ought to represent Christ day in and day out, no matter what our day jobs are.
The secret to overcoming the schemes of the devil is through the living Word of God. We must have knowledge of the scriptures and how to use them in order to conquer the enemy. Be intentional about learning and applying the truth that is written in the Bible.