fake it till you make it
idiomPart offake
fake it till you make it — idiom
1. to continue acting as if you are confident, skilled, or happy, even when you are
1.idiom
Definition
to continue acting as if you are confident, skilled, or happy, even when you are not, in the belief that this behaviour will eventually become real
Example
On her first day as a manager, Naoko felt nervous but decided to fake it till she made it.