My advice to anyone is
a) Get the skills to excel in your field
b) Have confidence in your abilities
c) Don't exude too much self confidence until you have completed a and b
Don't get me wrong, self confidence is very much important in this new world, however, the more you express it without proper personal backup, the more you are setting yourself up for a very hard landing one day.
Get the skills right and the self confidence will navigate you to success
