if you imagine a failure you can surely imagine a way to avoid the failure.. that is really the point.. to be prepared.. and also to be prepared to realize that the failure is not really not so bad and is really a part of every endeavor.. without it there is no success. If you imagine you always only succeed you will accomplish a lot less.
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.