5. Don't throw anything in the garbage. Recycle, reuse, sell and donate instead. As tempting and easy as it is to pitch wire hangers, musty clothes and shabby furnishings, be environmentally responsible and find a home for everything. A can of Comet with a few shakes of powder left could make someone else's sink sparkle if you don't want it; consider giving supplies to a shelter, neighbour or cleaning lady.
6. Label three bins To Keep, To Sell and Charity (bins should be manageable when full). For the average downsize, keep only one-third to one-half of your belongings.