One decluttering approach: 

1. Place 4 large boxes (or 4 large floor signs) in the middle of a room…Labeled  'recycle', 'trash', 'donate' & 'keep'.  

2. Place every item in that room in 1 of the 4 boxes/areas. Continue filling the boxes until all your items are in 1 of the 4 boxes/areas.

3. Remove everything from the room except the items in the 'keep' box.  Be ruthless.  You know what to do with box #1,2 & 3!

'Clutter clearing is not just once and done. Trimming is an ongoing process'