I got rid of a handful of things through the Buy Nothing Group last weekend, all stuff the kids don't play with anymore. I also went through my daughter's shoes (I think we pulled out 4 outgrown pairs, and bought one new pair yesterday to replace them), and filled the recycling with more papers from when I went to college and a bunch of kid art papers. I have been putting all of their paper stuff in a cupboard and then go through it periodically when the kids aren't around, because otherwise my daughter wants to save everything. I hand pick the "best" kid art and then get rid of the rest.
I have made a lot of progress lately but I still have so far to go that it's easy to get disheartened. Well, I'll keep plodding along on the downsizing. I really want to go through all of the cupboards, drawers, boxes, etc and only keep what we REALLY need/want, but damn, it's hard in a house of five when no one else is interested in getting rid of stuff!