>it took me less than a week to understand enough to be able to set up an IPv6 LAN.

Don't mean to brag but it took the 12 year old me less than an afternoon (armed with a CISCO book) to understand IPv4 syntax/routing/ARP/DHCP + whatever and roll it out to my 2 computers lan.

The difficulty curve jump from IPv4 to IPv6 is humongous (IPv6 + ancillaries took me 2 days to setup in my home, and that's with a decade of IT experience.)

The issue is there are just so many officially right ways to do the same thing. Even assigning 'static' addresses has 3 official methods. Yes I get why there are so many of them (flexibility!) but it's a lot of stuff to learn and put together.