Thanks everyone for the welcome and advice. Sorry I took so long to get back here.
No problems with my botched oil/filter change. Everything works fine. I drive north on Highway 187 from Garfield to Truth or Consequences second Sunday of the month for a poetry reading at the Black Cat bookstore. I average 65-70 mph while loving the fantastic scenery. Top speed is about 90. I rarely go over 70 but I wanted to see what she'd do.
Just a wee bit over 3,000 miles now. I drive into Hatch 10 miles south about once a week to top off the gas. Yes, Sparky's! I did a little feature on them at the ninth year birthday party. It's on Medium. Free to join, I don't think you can see it otherwise.
https://medium.com/geezer-speaks/look-at-the-crowd-here-we-dont-need-to-make-...I'll be looking around here for a solution to my weeping gas cap. I do keep the gas just below the filler line.
Also I'll be looking here for opinions whether I should start running synthetic at my 4,000 mile service.
Oh, as to valve adjustment... not me! I'm not mechanically minded. I think oil changes and battery maintenance and lube points and cable lubes are about all I can safely handle.