You can always try the Clean Sweep method. It's a home improvement show on the TLC network.
What they do is clean out the room, completely, and put everything on the lawn (or where ever you have space). Then they have 3 areas that the "stuff" must be sorted into. Keep - Toss - Sell Then they have a yard sell with the items that are in the Sell area. In your case you'd need to have the Keep pile in a manageable state so you can fit it somewhere else in your house.
And of course you'd need the weather to cooperate with you as well.
Well, Good Luck!!