Confidence is a hard goal to aim for because you never really have it until after you initially need it. if you wait until you feel confident to try something you may never get there.
Instead you might try focusing on being courageous.

It’s very human to set a goal without playing it through in our mind and anticipating some of the challenges. I make this mistake all the time. And I’d probably be out of a job if it wasn’t an almost universal trait. Hiring a coach is a good way to go, but starting with these steps will go a long way.