That looks like a pretty good way to go. I've been at it, too, insulating over the garage, making a cover for the attic stairway, and adding a radiant barrier on the most sunlit side of the roof, a little at a time. It'll be interesting this coming winter and summer to see how much it helps. It certainly can't hurt.
Another easy area to insulate is plugging up the fireplace opening when not in use. We don't use ours, and it generated a considerable draft all the time, even with the damper and doors shut tight. A couple of foam boards glued together and a nice looking fabric cover fixed that problem, and looks good at the same time.
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