THE RULES OF DISENGAGEMENT:
#1. If it—the thing, the belief or conviction, the memory, the job, even the person—weighs you down, clogs you up, or just plain makes you feel bad about yourself, throw it out, give it away, sell it, let it go, move on.
#2. If it (see above!) just sits there, taking up room and contributing nothing positive to your life, throw it out, give it away, sell it, let it go, move on. If you’re not moving forward, you’re moving backward. Throwing out what’s negative helps you rediscover what’s positive.
#3. Don’t make the decision—whether to toss or keep it—a hard one. If you have to weigh the pros and cons for too long or agonize about the right thing to do, throw it out.
#4. Don’t be afraid. This is your life we’re talking about. The only one you’ve got for sure. You don’t have the time, energy or room for physical or psychic waste.
Here's a link to the book: