Also, one of the best ways I found to keep my expectations and judgements to a minimum was to say I would only do it for ten minutes a day. Just ten minutes, and not to exceed that in the beginning, so I wouldn't judge the next session for being shorter or longer than the one before. Write for ten minutes, stop, don't bother re-reading it unless it really intrigues you. Then walk away. And tomorrow, another ten minutes--it's a small amount of time, and you can just write "screw this" over and over if you want. But most people find that, eventually, it gets easier, and less scary, and more valuable.

Or not. It's up to you.