Get back in touch with yourself, and the rest will come naturally
Self-confidence depends on your relation with yourself, and how much you are able to trust yourself. This grows spontaneously as a side effect of growing self-actualisation, which grows spontaneously if we come back in contact with ourselves.
Many TM practitioners notice that they spontaneously gain in self-confidence, often already after a few weeks, and that this influences all areas of life. This was scientifically confirmed by several studies (click on the research tab).