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.

Being an imposter often means we’re breaking trail. It’s a feeling that accompanies exploration, cross-pollination and innovation. It’s disruptive and uncomfortable because change is disruptive and uncomfortable. It means we have something to share and something to learn.