I figure it's the second of a two-shot regimen that mostly affects people, so I just won't plan anything for after. (As if I might have plans.) As someone who had a bit of a nasty reaction (flu-like symptoms for 3-ish days. Yay, immune response!) to a flu shot a couple times in the past few years, I won't worry about it.
I quit giving blood because the last few times, I got a nasty migraine afterwards. But shots? Having been in the military, I managed to avoid the plague vaccine, and anthrax. HepA & B, rabies, yellow fever, typhoid, I've had. Plus, the old peoples' vaccines for pneumonia and shingles. Probably more that I can't remember. Mostly, I get a sore arm. I'm happy to say I've had none of those diseases.
The Covid-19 shot seems like a walk in the park.