that thing the teacher taught you first on chemistry

I want to quote:

"The energy is not created or destroyed, it can only be transformed."

Yeah, it might sound familiar to you. Chemistry class, while you were bored. Or maybe transformers.

The thing is, lately I remembered that quote. And you can apply it into writing, if you change it a little:

You destroy to transform. 

That's all you've got to know about writing. You just don't go and write and bum, is amazing. No, it isn't. 
You destroy the draft, you destroy the better version of that draft until you transform it into what you want.

Keep going. 

And don't forget to destroy that draft, to convert it in the history that you want to tell.