"Knowing that I'm about to have fewer body parts is kind of weirding me out, even if it's a body part that doesn't normally make itself known."

A mood. My lower wisdom teeth absolutely had to go (they were well past starting to cause problems), but I still had weird stress dreams on that theme during the run-up. I don't think I'd handle any larger amputation well.

Hopefully everything goes smoothly for you! From my own experience and other reports, the pain and much of the hassle usually subsides after the first three days (counting the extraction as day one). It sounds like you're very well prepared as usual.