This covers obtaining the ISO, connecting to Wi-Fi, partitioning, formatting, mounting, installing, setting up encryption and installing GRUB, in one article. Also includes some tips, like quickly mounting from install medium. Maybe this helps someone.
Okay, so it came down to a licensing issue rather than one that is technical. I can definitely get behind that as somebody that will always value true open source, even when then the proprietary solution might be the better one in the short term. Something that is open source can only get better.
In the Gentoo wiki it is also mentioned that "While it is true that Btrfs is still considered experimental and is growing in stability, the time when Btrfs will become the default filesystem for Linux systems is getting closer.". I don't know how many distros out there use Btrfs by default (never distrohopped), but it seems to become much more widely adopted than zfs.