Totally agree on the not-buying-stuff line. I would add the little vibrating bassinets thing. Max slept in that next to our bed for at least the first month.
My favorite “ah-ha!” thing was when Jen realized that putting Max down to bed on cold sheets woke him up half the time. So, she put the heating pad on low in his bassinet for a few minutes to take the chill off, then removed the heating pad and put the kid down.
Oh, and you don’t need to babyproof for a few months either. They’re pretty much just sausages for the first 4 months or so.