If you're new to books on decluttering, New Order is a good place to start. It's a quick read, the author is witty and fun, and everything is made very accessible for people of all levels of commitment and time availability. That said, if you've read other books on decluttering, it doesn't offer anything new, in my opinion, unless the other books you read were all too strict or stuffy and you're just looking for a more approachable take.