Yes, conjuring up the right words can be a b*tch, and it's so tempting to step away from the keyboard in favor of something that's simpler or more lucrative. But the magnet that keeps pulling me back -- and making it easier -- is this sense that people out there genuinely need the story or lessons that I'm trying to convey.
Start with: Who's my audience? Then: What's my message? Then: Why do they need this? Get solid about all three of these, and a lot of good things happen. You'll press ahead with flawed but fixable first drafts. You'll come back and do the rewrite necessary to get it better. And when your confidence flags, you'll get revived by connecting with readers, friends, fans, etc. who want and need you to succeed.
Writing may seem like a solo sport. In a lot of ways it is. But the more you can conjure up a community that cares, the stronger you'll be.