You may never feel ready for the thing that makes you ready.

Readiness is largely produced by the experience you are waiting to feel ready for. The role teaches you to do the role, the first difficult conversation teaches you how to have them, parenthood teaches parenthood. Waiting for the feeling first is waiting for an output at the input stage.

Rather than asking whether you feel ready, ask whether you could begin and learn. Do you have enough to start, and could you handle the early mistakes. If yes, that is as ready as this kind of thing gets, and the confidence you were waiting for will arrive somewhere in the middle.