It sounds so simple.
Ask - Is it Useful? Is it Beautiful? Does it make me Happy? Is it Family History?
If the answer to None of these questions is Yes - recycle or trash.
If it is useful, but we won't / don't use it - donate it.
If it is beautiful, but we won't/ don't see it - donate it.
If it is useful and/or beautiful, but it makes me unhappy - donate it.
Surprisingly not. And rather time consuming.
I have been working away in my room for hours.
My son came in, "Let's see. There's stuff all over the bed. There's stuff all over the floor. Yep, you're cleaning."