Okay, it's time for big game hunting. Pick up your mug of coffee or whatever and take a little stroll around the house opening cupboards & closets and scanning for your prey: the Undesired Spacesucker.
I bet you can find 3 things bigger than your head that you would be perfectly happy to get rid of or at least move to a less accessible storage area.
Did you buy one of those sexy new cyclonic vacuum cleaners and keep the old one "just in case"?
Got a pair of rollerblades you haven't used this century?
Fondue pot you got as a wedding gift that might be a wonderful kitchy "going off to college" gift for your kid?
Hunt 'em down and drive them from their lairs. The wipe out the dust and put that space to better use.
(Super-discardians are encouraged to try this sport on each and every cupboard, closet and drawer; find the biggest discardable thing in each of them!)