I think I don't understand enough about how timeshift works to not cause problems for myself.
Here are some scenarios.
Update or add software, pamac says need a reboot for changes to take effect, installs more software before doing reboot. Reboot and now machine hangs as described in earlier posts.
Goes back to previous snapshot by selecting it from grub menu, previous one hangs too.
Goes back to the other previous version, now that one works. Does not go into timeshift and "restore" the snapshot because I foolishly thought that by going back to the snapshot in grub I was restoring, didn't look closely enough at the directions.
Does new pacmac -Syu still without having restored properly. pacman -Qs shows kwin being incorrect version.
Does pacman -Syu kwin which updates that version of kwin-lowlatency is now correct 5.21-1.
Reboot takes me back to being hung as previously described, probably because I fixed something in a snapsnot that was never restored properly.
I finally realize I was doing something wrong and not really restoring, so I go back to the snapshot that worked before, load it up, and open timeshift and restore. I still am too thick headed to realize I need to reboot after the restore and before doing anything else, and also even worse, while timeshift is still open I try to do pacman -Sy extra/kwin which makes the new pacman command fail, but the automated snapshot taker has already blown up since the old snapshot I restored was missing and because there was another instance of timeshift running.
Now, no windows can be opened as the snapshot I was logged into is actually deleted so there are no executables remaining, I can't open anything, but I still have a browser window open on this page so I am able to post about something strange going on. Anything I try to open gets an error.
Try reboot to default, which theoretically would have been fixed if I hadn't run the extra pacman command at the end, of course it couldn't even be found by grub since it got deleted.
Try each snapshot in turn, all except for the very oldest from 2/16 either can't be found at all (3 others) or has the original hanging problem after entering password to log in and while being asked for wallet password as previously described.
Now I'm sitting on the last snapshot that works, thinking I need to go into timeshift and restore this snapshot, then reboot, then start over with pacman -Syu. What I'm afraid of is if I do the restore and reboot that I'll be getting hung.
Any last minute advice on changes I should make to my plan would be appreciated. I will gladly listen to your laughter at my noobish mistakes too, because honestly I think it's pretty darn funny how badly I messed up my system with my lack of understanding.