One more tip from an avid junkie - document/catalogise your gear often! When I've stated to take images of the stuff I'm binning for future projects, along with placing some notes over the images (I have Note 3 smartphone with a pen - perfect for that) it became much more manageable not only to find the tucked away stuff real fast, but also to rotate the free space efficiently, quickly figuring what could go to the trash from the collection in order to find proper place for the new stuff.