Mistake 6: Allowing undesignated space
Got a messy dining table? When space is available without a clear purpose for how it's used, it usually gets filled up with clutter. Have a rule that large flat surfaces, like tables and countertops, must be cleared off daily, or at least once a week. And if you have multiple compartments for paper on your desk, label them for envelopes, catalogs, bills, or other distinct purposes instead of letting them become a nest for whatever ends up there by accident.