This book which outlines the process that I used with all my clients while I was a professional organizer - from the casually cluttered to borderline hoarder. No muss or filler. Just my straight forward process that successfully worked for those I worked with. Maybe it'll work for you too.

Former Pro Tip: if you don't create organizing systems that you can maintain over the long run, no amount of money or hacks will get and keep you organized. And if things work for you but people who come over don't like your home - that says everything about them and nothing about you. You create your home into what YOU want it to be - not what friends, family, Pinterest, or a professional organizer tell you is "should" be.

Don't should on yourself.