Before you start on each area, take a picture of it. By looking at a picture of the clutter, you can view your rooms from another, more detached and less emotional perspective. Afterward, you'll be able to enjoy your new room even more once you take an "after" photo to do a side-by-side comparison.
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Down the road, you'll also have photographic reminders of how you never want your home to look again. While you have your camera out, consider taking pictures of mementos that you're going to haul out. Letting go of things is often easier if you have photos that preserve the memory of them.