My former partner Dennis Palumbo, now a top psychologist for show biz folks, writes about seeing the forest for the trees.
The advice he gives is, as always, sound. Writers worry way too much about what they write, often to the point of letting that worry prevent them from writing. Years ago, I used to tell friends with this kind of blockage, "Hey, write it and then decide if it's any good. You can always throw it away and all you'll have lost is the paper plus the time you spent writing it. You're already spending that time staring at the typewriter or finding excuses why you're not writing. So spend it writing." These days, it costs even less since if you decide the thing isn't even worth printing out, you aren't even wasting paper.