When the Lord Jesus was on the cross, He had authority to come down if He so wished. By the same token, those who are crucified with the Lord can let their old man come down from the cross if they so choose.
The best warfare to engage in against the devil is to magnify the Lord Jesus in your life. The Bible declares,"Let God arise, let his enemies be scattered..." Psalm 68:1.
Worship is the spiritual equivalent of the power of magnification. When you begin to worship, you ascend to join the Object of your adoration. If you are soaring in His presence, then you are looking down on your problems.
"Oh, magnify the Lord with me." - Psalm 34:3
If we would pray more for others, promote what God is doing through others rather than ourselves, then the Lord would begin to promote us.