I've had some of those hoarding shows playing while I try to figure out where I can put the stuff that's blocking my hall. One of the shows had a counselor asking the home owner whether they needed something to live a functional life or if they wanted it. I'm trying to ask myself that question as I go through these things.
I also came across a tip, I think in one of these shows, suggesting that you just handle the thing once. I tend to defer decisions and move things from one place to another, so I am trying to catch that as well... although I did take a stack of DVDs I will probably never watch and move them from one bookshelf to another, so not sure how well that's working for me...