Defensive pessimism. Imagine how/why you will fail at your goal. Imagine concrete steps. Write it all down, revise when something different happens.
Gads, no. I've got a brain that sees things potential problems. I've concluded that spending your time picturing failure is a great way to invoke akrasia - by focusing on failure scenarios, you develop an availability bias for failure scenarios. I call that the "futility bias".
I need to spend more time imagining how things will succeed.
I hope you realize the irony in imagining yourself failing at the imagining yourself failing exercise.
the video
I'm posting this because akrasia, procrastination and willpower are often discussed on LW. I haven't read the book, but for those that are interested "The Willpower Instinct" and "Maximum Willpower" are, from what I can tell, exactly the same books.