I have a friend who's a hoarder. She lives in a tiny apartment, and can't/doesn't want to move because her rent's been fixed since she moved in 8 years ago so it's ridiculously low, and she loves being in the west end.
However...she's addicted to shopping. I'm not kidding. She buys stuff pretty much all day long, on ebay mostly, when she has money. She is a crafter, which doesn't help. She knits and weaves and does beadwork and always has all these ideas of things to do next. For example...she decided for my birthday one time that she was going to, as a gift, get stuff so we could make our own candles, which I found kind of cool. What happened? We went to a warehouse and she spent $200 on wax sheets and wicks. We still haven't made the candles. It's been 2 years.
She finally lets me go into her apartment. She's been so anxious about letting anyone in there because of the state of it. I can't move around at all. She really struggles with it. But she wants to somehow make it work without giving anything up.
In her case, this will be impossible and I strongly believe that she will just end up living the same way until she is able to give up some of the stuff, or else move, and either way, stop buying things. I'm not sure what your situation is but if hoarding is a problem, I've heard it can be best to start out small. For instance, getting rid of some of the stuff you don't need anymore. Not all of it right away, but some of it. A GREAT place to start would be, going through the stuff in boxes and seeing if you can compact it, then break up and recycle all the packaging you no longer need.
Others think it's best to just 'dive in' and get it all done at once. I am hesitant to suggest it if you're a super hoarder and the idea of parting with even a piece of paper gives you a coronary. Either way...have you talked to someone about it? A T?