In It's All Too Much, Walsh helps you do the same thing with your own stuff. He doesn't just tell you how to organize. He helps you understand your relationship to each of the things you own, and helps you overcome all of the excuses you have for holding on to unnecessary things. He helps you own your stuff, rather than your stuff owning you.
Each time I've read this book, I've been so motivated afterwards and been able to get rid of a lot of stuff that had built up over the years. And each time I've used the advice from the book to really purge our house of unnecessary stuff, I've felt so good afterwards and like a literal weight has been lifted off my shoulders. With all that unnecessary stuff gone, I feel lighter and freer.
I really recommend this book, especially if you have any kind of cleaning/organization inkling right now. It's amazingly helpful.