Think of your “desert island list” applied to real life.
Gee, trying to cut it to even a thousand books or recordings seems impossible, at least in my case.
Would there even be sufficient room for all the survivors at the new destination?
And that’s before the clothing and kitchenware and …
What would be hardest for you to pare down?
Jnana's Red Barn 
I’ve been working on the downsizing project for about five years. After getting rid of several thousand vinyl records, about 5,000 CDs (acquired through years in radio) and probably 2,000 books, I still have about the same numbers left, which is way too much – but I have already cut to the bone.
Wow! As a vinyl fan, especially, I’m feeling some pain there. I did purge about a thousand books a half-dozen years ago as a start.