"Do the scary thing first, and get scared later." - Lemony Snicket
I love this so much because all it really takes is one moment to swallow your fear and push through. Sure it's terrifying but it can be exhilarating too. The power you feel when you overcome a fear is one of if not the best thing ever. Fear is the only thing that can hold you back. If you're struggling to get over a fear build yourself up to it.
For example: I've been a bit nervous because I really want to write a book but it just seems too big. So instead I took a small idea I had, developed it and then write a short story. Even that was broken down into 500 words a day.
(Idk if this was just common knowledge but I hope it helps!)