Went ahead and mounted toy spare. Stupidly forgot about pain meds until after -- should've taken pills and waited 40 minutes before pulling out jack. Lug nuts overtightened; passer-by loosened them (large, healthy+athletic-looking guy; still barely able to budge 'em and had to rest after -- felt I owed him a bottle of Gatorade; dunno how long it would've taken me alone ... need larger wrench than wee cross-shaped one I have). Managed to only scrape knuckles once. Tire is toast; sidewall split. Looks like I just barely beat the rain. Punting entire to-do list and lying down, in hope of being able to move later and go to dinner @ neighbour's. Currently shaking and hurting. But dammit, got the %$^@ing toy spare on so I don't have to wrestle it tomorrow.
Washed all visible signs of tire-grime off my hands but Perrine still says, "wow, your hands smell really interesting!"