It is overwhelming, but I also think it helps give you some sense of control as you noted.
I did a whole home remodel last year while my youngest was a senior in HS (can you say denial?) and even after almost a year back in the house, I'm still cleaning and organizing. It's been a good opportunity to think about where I want "stuff" and where I don't. Lots of trips to goodwill, and some good opportunities to revisit old favorites while deciding whether I"m ready to pass them on. (Kids stuffed animals and soccer jerseys need to stay for a while longer. Old pictures need a new home.)
Enjoy it as a process - and congrats on the cleaned spaces!