"Sorting through a lifetime's worth of accumulated possessions can be a daunting and stressful process that millions of Americans confront every year. The need to downsize often arises at a momentous life change, whether you're an empty nester or retiree selling your family home, a newlywed blending your households, or you're cleaning out your parents' property after they've moved into assisted living or passed away. Decluttering guru Peter Walsh...