How do you become a new creation in Christ?

58-1221E
The Unity Of One God In The One Church

God sets on the throne of your heart, in His control room, controlling your emotions, and controlling your powers, controlling your conceptions, and making you one with Him, in fellowship and in love. And God fills you with love. He fills you with power. He fills you with the Spirit. He fills you with His Own Divine nature, and He changes your carnal nature into His nature. Then, in this, you become a new creation in Christ.

Daily Bread Philippians 1:6
Being confident of this very thing, that he which hath begun a good work in you will perform it until the day of Jesus Christ.