He was my go-to author way back in the 80s. I read that book, plus others. He really helped with the emotional aspects, the psychology of decluttering, not just the how-to. I was very much stuck in the keeping of everything that had sentimental value. Don Aslett gave two pieces of wisdom that have stayed with me to this day:
1. Getting rid of the thing does not mean you're getting rid of the person who gave it to you, or the memory.
2. Take a picture of yourself with the object. Keep the picture and let the object go.