Despite my sewing-underwear adventure, mending/fixing things comes before sewing. I’ve had a pair of jeans I bought from Goodwill (using only measurements because they took away the dressing rooms during the pandemic and never put them back) that were too long. This is par for the course for pants because I’m very short-legged.
I have been taking all my pants to the tailor to hem them, but my sewing machines are handy, so I thought I would do the job myself. I watched a tutorial for making a Hollywood hem, which is where the original hem is retained, the excess length is cut away, and then the hem is reattached.

Success! Thanks to the very helpful step-by step video from WeAllSew, I now have a good looking hem and my jeans are the right length! In the picture you can see the fold where the new seam is at the top of the picture, but looking at it from a distance further away, it looks like the original hem.
I’m very pleased, and big thanks goes to Alison Freer, the author of How to Get Dressed for alerting me to the existence of the Hollywood hem.