When I started querying my novel, I tried to think of a way to make the inevitable rejection a fun and inspiring part of the journey. Rejection needed to spur me on rather than discourage me, and as with any unpleasant task, a little reward goes a long way.
Don’t judge anything that wants to live on the page. Start writing whatever comes to mind first, and don’t worry about where you start and where you finish.
If you want to get your project written, you have to prioritize actually writing. Do your plot outline. Push the crap off your desk. But don’t get stuck getting ready to write instead of putting down one word after another.