This is the practical application of "seek[ing] those things which are above" (Colossians 3:1). In effect, Paul is saying that, if we are seeking heavenly things, the resources to overcome these things will be available. They will be part of us because God responds to those who are truly seeking Him.
We must be patient. Our relationship with God is not magic. It takes work. Those of us who have had any of these problems understand that one must hold a tight rein on oneself to keep from doing the things that Paul says to "put off." They are so deeply ingrained within us that they want to break out all by themselves.
This is why Paul writes in Romans 7:15-23, "The things that I do not want to do, I do. The things I do want to do, I do not do." He concludes that two conflicting laws were working within him. There was the law of his mind, which loved God, understood a great deal about Him, and wanted to submit to Him, to sacrifice for His sake and in His name, and to discipline himself. But the law of his flesh—sin that dwelt within him—every once in a while reared its ugly head and broke out.
Thus, we must discipline ourselves. We know that we are to "put off" those things that do not reflect the image of God and to "put on" the characteristics that do. "Putting on" and "taking off" are not always easy. Sometimes, we can readily apply or overcome certain things; they seem to come easily to us. But other character flaws are thorns in the flesh, their barbs stuck deep within us, and they embarrass us from time to time and make us feel guilty. They make us wonder whether we will be acceptable before God. Seeing this, we realize that overcoming them will take a great deal of work—and work requires discipline.
One of the final things that Paul mentions in this passage is love (Colossians 3:14). Love is the crown; it tops off, as it were, all of the other virtues, tying them all together. A true love for God and love for others—not to mention a proper love for ourselves—will motivate us to transform into Christ's image.
The diligent "putting on" and the "taking off" will be the proof of our seeking God and the things which are above. When we understand this, we realize that even the ability to "put on" and to "take off" is a gift from God, as the resources to do this come from Him. God responds to those who make Him the focus of their lives, and this is who we exhibit. The evidence begins to show in the way we live our lives.