The victory comes by faith, but it comes only by FAITH anchored squarely in Christ and the Cross, i.e., The Blood of Jesus, i.e., The Finished Work. If anything else is made the object of faith, that's when the victory stops, and stops instantly (Gal. 5:4)! The Holy Spirit will work in our hearts and lives, Who Alone can bring about these things, strictly on the basis of the Finished Work of Christ (Rom. 8:2). In other words, the Cross of Christ is what gives the Holy Spirit the legal right to do what He does.
Therefore, to be an overcomer, one has to place his faith solely in Christ and the Cross. When one does this, one is instantly judged by the Lord as an "overcomer" (Rom. 6:1-14; 8:1-2, 11; 1 Cor. 1:17-18, 23; 2:2; Gal. 6:14). This is not something that one works towards, or gradually comes into, but is a place and position we have solely in Christ. He Alone is the Source, and the Cross is the means.
Our Faith must be in event #1 only!
JSM