The first step is to believe God means what He says, and reject any feelings to the contrary. If you had a friend you deeply trusted, you would believe his or her word over the word of someone less reliable. Faith means showing God the same trust. We need to remember that our feelings and the circumstances around us are not in any way as reliable as the God who created us and who upholds the universe. I gradually began to respond to situations that made me anxious by resisting the anxiety and directing my thoughts to God's promises instead. I would focus on God's words instead of my thoughts and feelings, and on remembering that the fulfillment of these promises depends on God, not on me. Instead of driving faster or sitting up at night worrying over the next day's work, I needed to trust that things were in God's hands and He would take care of them.
I struggled with applying this because it seemed too easy - it seemed like I was just being lazy and putting off my own responsibilities onto God. Part of the deception of anxiety is the idea that everything really depends on what we do. But that is not a life of faith. The life of faith acknowledges that we are dependent on God, and that we can't succeed without Him. Jesus told His disciples: "...apart from me you can do nothing." (John 15:5). Paul tells us that our very salvation "depends not on human will or exertion, but on God, who has mercy." (Romans 9:16). And he told the Galatian church that if they received the Holy Spirit by faith, it was foolish for them to think that having begun by faith, they were now being perfected by their own work. (Galatians 3:1-7). The Christian life is a practice of depending on God by faith from beginning to end. We trust Him, and He shows His glory and faithfulness by always giving us what we need.