Downsizing? Measure each room and the route in, from doors and halls to stairs...

https://wiki-view.win/index.php/Common_Downsizing_Mistake:_Keeping_Everything_Until_After_the_Move

Downsizing? Measure each room and the route in, from doors and halls to stairs and lifts. Sort furniture into keep, store, sell, or donate piles. Choose pieces that fit, and keep walkways clear