Stop waiting for someone to tell you you’re ready. They’re busy waiting on someone too.

Waiting for a signal assumes somebody is watching closely enough to send one. Mostly they are not, because they are busy waiting on their own, and the people who look certain are usually just further into something they also started unsure about. Readiness is rarely a feeling that arrives first. It tends to show up partway through.

Pick the smallest real version of the thing and start it this week. Send the message, book the slot, write the first page. You can stay unsure the entire time and still be moving, which is what nearly everybody who got somewhere actually did.