Am reading: The Art of Asking by Amanda Palmer
I just posted this for my writing students. A few were concerned about their lack of legitimacy. I told them that the feeling never really goes away. (See Impostor Syndrome)
There's never a moment when you feel 100% ready to start submitting your work. You just have to risk the leap.
"Fake it 'til you make it," I told them.
That's what the rest of us are doing.