I think self-persuasion is a habit, and anyone can learn it.
Let’s take a look at what does self-persuasion means: “Self-persuasion situation is that no direct attempt is made to convince anyone of anything. Thus, with self-persuasion, people are convinced that the motivation for change has come from within, so the persuasion factors of another person’s influence is irrelevant.” (Wikipedia)
You don’t need anybody or anything to convince you of what you are believing. Your knowledge, expertise, or personal growth is already enough for you to start, excel, or finish it.
I think that is very helpful, especially if you are a leader of an organization or managing people who are looking for guidance or inspiration.