Install normally as you do NetBSD be sure to enable option "log" in partition to your FFSv2 file system. Create at least one user from configuration menu while installation.
After install login to root account and follow these steps while CD ISO is in cdrom device:
For WiFI also follow this guide to work along with WiFi manager : https://archive.unitedbsd.com/t/netbsd-desktop-pt-2-set-up-wireless-networking-on-netbsd-with-wpa-supplicant-and-dhcpcd/281
Have fun and do report bugs and problems
Special Thanks to @leot @medfly @ryoshu @nbyouri and others from Freenode #NetBSD