The way to develop self-confidence is to do the thing you fear and get a record of successful experience behind you. (William Jennings Bryan, “the silver-tongued orator”)
A trite thought, perhaps, but it’s true: There is only one way to have experience and that is to do something. The more you work at a task—whether it’s speaking, playing an instrument, or just doing your job, the more likely you are to become confident in your ability. It’s important because people are more impressed by how well you do something than by your opinions.
We are confident of all this because of our great trust in God through Christ. (2 Corinthians 3:4)