1) Put EVERYTHING in a Maybe Box.
2) Put the Maybe Box in the basement, the attic, the trunk of your car, somewhere you can still reach it but not too conveniently.
3) Go about your life. If you find you need something from the Maybe Box, go get it.
4) At the end of 6 weeks, throw out everything that’s still in the Maybe Box.

This works for me because it removes all decisions about what to keep.

Standing with my clutter, trying to sort it… that’s where I always go wrong. I keep too much! That’s the reason there’s clutter!!

So instead of trying to decide which of 3 boxes to put stuff in, just put it all away and let your life decide what you need for you. Anything you’re willing to make an effort to go retrieve is probably worth keeping. And if you didn’t need it in a 6-week period, you probably could stand to chuck it.