Feeling ready usually arrives about halfway into the thing you were scared to start.

Confidence is a product of doing something rather than a requirement for starting. Waiting to feel prepared keeps you at the start line permanently, because the feeling is generated by being partway in and noticing you have not drowned. The order runs backwards from how it looks.

Start the thing you have been getting ready for, badly, this week. Give it enough runway to reach the point where it begins to feel possible.