Four years ago I was reminded of an injunction Stendhal gave himself early in life: Vingt lignes par jour, genie ou pas (Twenty lines a day, genius or not). Stendhal was thinking about getting a book done. I deliberately mistook his words as a method for overcoming the anxiety of the blank page.
My modified version: 20 minutes to write 20 lines, genius or (mostly) not. And then, sometimes, a long time editing them.