In the Spirit

Romans 8:1 tells us that we have no more condemnation when we are in Christ Jesus. However, it challenges us to not walk after the flesh but after the Spirit. In Galatians 5, Apostle Paul talks about the works of the flesh, he also teaches us that the flesh and the Spirit are at war with each other. To overcome the flesh we have to walk in the Spirit. Further, he teaches that we can only walk in the Spirit when we learn to live in the Spirit. How can we do this and how can we have Christian victory?