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The way that you develop courage and confidence is with knowledge and skill. Most fear and doubt arises out of ignorance and feelings of inadequacy of some kind. The more you learn what you need to know to achieve your goals, the less fear you will feel on the one hand and the more courage and confidence you will feel on the other.
Think about learning to drive for the first time. You were probably extremely tense and nervous and made a lot of mistakes. You may have driven erratically and been a danger to yourself and others. But over time, as you mastered the knowledge and skills of driving, you become letter and better and your confidence increased.
Today, you can quite comfortably get into your car and drive across the country with no fear or worry at all. You are so competent at driving that you can do it well without even thinking about it. The some principle apply to any skills you need to learn to achieve any goal you cans set for yourself.