The human self also has a nature, limits as well as potentials. If you seek vocation without understanding the material you are working with, what you build with your life will be ungainly and may well put lives in peril, your own and some of those around you. 'Faking it' in the service of high values is no virtue and has nothing to do with vocation. It is an ignorant, sometimes arrogant, attempt to override one's nature, and it will always fail.