Begin Before You Are Ready
Readiness is usually a side effect of starting, not a prerequisite.
You will rarely feel ready. Readiness is not the door you wait at; it is the room you enter and furnish as you go.
The first version of anything is mostly nerve. That is not a flaw in the plan — it is the plan. You are not collecting qualifications to begin. You are beginning in order to become qualified.
So do the small, embarrassing, insufficient thing. It is the only thing that ever becomes something else.