As I was coming from Ubuntu Touch who have their own recovery, I used the recovery image from the first post to install today’s image plus opengapps pico via sideload. Worked perfectly. First time wizard is completed, phone is up and running. Thanks 
I’m thinking of posting my experience like AnotherElk does in Updating LineageOS via TWRP + feature test if that’s ok. Any problems I’d report/discuss here.