The lines were so hardened that even after a snip or two, they were still nonelastic and easily damaged. I feel silly now for fighting them as long s I did Saturday.
Today my new lines arrived from Fastlane, and I replaced my poorly-seated lines (two), and no more leaks! And they're a snap to put on when they're fresh. I have two more to put on, but once I got those first two on, I just had to take it out for a drive.
I haven't touched the tie rods. I intend to take it into the shop for those, and by 'shop' I mean the one the P.O. used, not the one I used

I don't think my abilities/confidence are up to that task yet, and they do really need to be replaced.