Just so you know, I'm not usually a superstitious gal... Well, not anymore anyway. I used to be super superstitious, but I got better. Nowadays, I'm pretty good about not throwing salt over my shoulder, or flinching when a black cat crosses my path, or worrying about jinxes.
Nope, nowadays, my superstitions are confined to writerly things. For instance...
I cannot read writing advice if I want to write. I even see a blog with an advice type post and I steer far far away.
I cannot read about other writers having problems - like writers' block or stumbling or being at a loss for ideas. Even if they've solved the problem and have the answers for how to avoid it. (See #1 up there.)
These aren't just fanciful superstitions, though. For some reason, as soon as I read writing advice, I freeze up. I lose my self-confidence. As for reading about other writers' problems, more often than not I read about their problem and suddenly I have their problem. It's like a form of writerly hypochondria.
Recognizing these flaws, I stay the heck away. Sure, I could sit down and find a way to fix the flaws, but I don't want to chance the many weeks of not-writing it would take to fix any of this. So I avoid it all. (I'm really good at avoidance.)
What about you? What are your superstitions? Do you avoid them or have you tried to fix them?