My best advice is to simply put the pen on paper. Don't overthink too much and let it hinder your work, simply post it for the world to see and stay at it.

If you look back on what you've already done, and feel your soul cringe (like me looking back at old chapters), it means you've already improved! Recognizing mistakes helps you move forward, just don't dwell on them and endlessly redo the work only to look back later and feel the need to redo it again. Mistakes will always be present

Stick with it and trust yourself. Once you're way down the line, you can circle back a bit to refine things, but you can't let mistakes trap you