I think we're both going to be pretty sore for a while, too.
Almost worse, though, is having to don the mask and the goggles and the ear plugs. It's like having a huge head cold while you're working. The dust---which is flammable (and inflammable; fancy that)---does get rather all over the place. It'll take 3 passes sanding, though the 2nd and 3rd will be easier, then a first coat of polyurethane, which has to go on the same day as the last pass of sanding, then buffing and a 2nd coat of finish, and likely then buffing and a third coat. I'm pretty sure we'll be lucky if we have the first coat down throughout the house before I go back to work on Monday.
We got take-out Chinese food on the way home and I fear the old floor dust informed its flavor.