Prerequisites for overcoming Satan: Romans 16:17-20
17 My friends, I beg you to watch out for anyone who causes trouble and divides the church by refusing to do what all of you were taught. Stay away from them! 18 They want to serve themselves and not Christ the Lord. Their flattery and fancy talk fool people who don't know any better. 19 I am glad that everyone knows how well you obey the Lord. But still, I want you to understand what is good and not have anything to do with evil. 20 Then God, who gives peace, will soon crush Satan under your feet. I pray that our Lord Jesus will be kind to you.
There are many books floating around full of new theories and new practices for Christians to defeat Satan. These can be very misleading and often bring divisions in the church so it is far better to look at Holy Scripture. In this passage Paul states that the act of crushing Satan under our feet is not something we can achieve but is something that God himself will do. It is unbelievable how many people proudly assert how they are going to defeat Satan and crush him as if they themselves have the power to do so. They are even blind to the fact that every time they sin, including the sin of thinking too highly of our spiritual prowess, that they are defeated and mislead by Satan. Instead of following the latest 'spiritual' fad we should do all we have been taught by Christ himself rather than what the currently famous 'spiritual' giants teach. Only if we faithfully obey, do what is good and stay away from what the Bible calls evil then God will give peace and crush Satan under our feet. For indeed the battle belongs to the Lord so we better hide under His wings by obeying all He has commanded us: Doing what is good in His eyes and avoiding all evil.
In other words: If we obey Jesus' requirements for discipleship 'to obey everything I have commanded you' we can be sure that His presence is always with us (Matt. 28:19-20) and as He has all power in heaven and earth (Matt. 28:18) Satan will surely be crushed.