If you think you might have a tendency towards hoarding, please, think of the children. Your own, or whichever younger family members have to clear your hoard when you're gone. It's a really cruel thing to do to them.
Anything that might be of ongoing interest (family keepsakes, valuable collectables, etc) is much less likely to be found and treasured, if it's mixed in with a houseful of physical noise.
So be ruthless with stuff. Especially if you're a greenie who feels guilt about landfill.