"Fake it 'til you make it." If you say you can do it, people believe you. Once you have done a bunch of stuff and people know you can do it, you can tell them

"Fake it 'til you make it." If you say you can do it, people believe you. Once you have done a bunch of stuff and people know you can do it, you can tell them you'll figure it out, and they'll believe you.