To me from me
I have never been a fan of advices, though I have found some and they often are contradictory. I believe that is fundamental to listen to your inner voice, which is hindred by your overreactive mind.
So my advice would be to be couragoeus and just do something, try, experiment, which is a very difficult endeavour facilitated by turning off the critical thinking, at least whilst in the middle of writing, as opposed to outlininig, and focusing on the moment. It also helps to remember that you enjoy what you are doing and play the game for the sake of the game, so to speak, without goals and expectations. All of which is more easily said that done, no doubts about it.