The times I've been successful with something I've wanted to do, I've done the exact opposite thing. I get a really strong motivating reason--"I really need to tweet this idea!"--which is impervious to any argument against it. I do what I can, or even change my circumstances to make it happen.
Comments
"That's okay. I'll write as much as I can, then keep thinking about it."
"But you have other stuff you need to do!"
"No problem; I'll just write and do that at the same time!"
"But what if people don't like it?"
"Pfft, I don't care. It's for fun."
Somehow, I keep re-inventing the wheel on these things. I've known about these techniques forever but never bothered to use 'em.