Categorize your belongings, log old items for disposal, and find what you need instantly.
Don't try to catalog the entire house. Pick a drawer or a closet, map out the space, and log just what belongs there.
As you throw things away, actually archive them and mark as "Disposed". You'll get to see exactly how much you've successfully un-cluttered.
Set up tags like "Keep", "Maybe", "Sell" and filter your items later when making the final call.