I picked up 'The Power of Your Subconscious Mind' a couple years back during a real slump, thinking it might help. Honestly, I'm pretty skeptical about self-help stuff, but I gave it a shot. The main idea—that you can reprogram your thoughts for success—sounded good in theory.
From what I've seen in online reviews, a lot of people swear by the visualization and affirmation techniques, saying they've seen real changes in their confidence or habits. But just as many call it outdated or oversimplified. It seems like its effectiveness totally depends on the person; if you're already inclined toward positive thinking, it might click. If you're a cynic like me, you might just end up frustrated, thinking your subconscious is ignoring your memos.
I still flip through it sometimes when I need a pep talk, but I take the 'scientific' claims with a huge grain of salt.