I'd do one room at a time and start with something that will make an immidiate impact, with me it was the huge bookcase of DVD's I went through them and took out all the ones I thought we would never watch again and sent them off to other members of the family, carity and the bin as appropriate. Dont make the mistake of asking OH if there are any that he wants to keep thoough, you'll find that the pile you want to get rid of isn't quite as large as you would like. While all the things are off the book case give it a clean and pull it out and hoover behind it. Then move on to the next cupboard or drawer, again, just do one at a time otherwise it will be to daunting! Don't let the OH put you off, ban him from the room, put your fave music on, poor a glass of wine and get to it! Good luck