This is going to be a multi-day effort. I'm attempting to mend more than one of my brother's too-well-loved jackets. He's probably not up to the job, either in terms of experience or coordination, or I'd try to teach him to do it for himself. I'll be making this up as I go. Various pockets aren't holding stuff too well after his phone and other gadgets wore through either the seams or the material. Fortunately, most of the repairs are on the inside, so replacement fabric and other repairs don't have to match exactly. Also, the outsides are in good enough shape that repairing the jackets is worthwhile. Unfortunately, to do the repairs with a sewing machine would mean taking stuff apart completely, so I guess I have something for my hands to do while I listen to podcasts and stuff.
I'm not sure if it's a good thing or not that there's no deadline. On the one hand, I can poke at it when I feel like it and set it down any time. On the other hand, there's no great urgency to pick it up again if I get discouraged, bored, or busy, which I probably will.
Progress so far: evaluate the damage, confirm brother is okay with proposed replacement fabric (yep), remove and return various objects that were still stored in pockets (and in one case, down in the liner), check if the jacket manufacturer can offer any support (nope), unpick the first pocket enough to get the damaged part out, and cut a piece of replacement fabric.