When I decided to get serious about doing a similar thing as this, I began by going through one drawer or cupboard or other kind of space thoroughly all at once and then calling it quits until the next time. Gradually I got through all the spaces where stuff lurked. Then I did it again. Eventually I got the stuff down to some kind of reasonable level and have mostly managed to keep it that way. Oh, yes, and moving to another state helped too. It’s amazing what you decide you don’t need to pack up and carry across the country. But you don’t have to move. You could just pretend to yourself that you are going to be moving sometime soon.