Of course, mistakes were made. We'll look at them as we go.
Here's number one, however.
Before selling your house, take some pictures. You'll want them.
We emptied the house, painted the rooms, redid the basement floor. But never really captured the "the way it was" photos. I was copying some tapes and watched the kids playing in the basement back when it was a playroom/sewing room/everything room.
What's really important, however, is setting your priorities. In our case, closing up the house and downsizing to a small apartment was priority one.
Setting "good" garage-sale prices was not important, so we didn't price anything. We'd suggest a price; whatever counter-offer we got was the final price. The goal was to clear out the house, not recover money from the mountain of stuff.