I soloed Naberius 1 Time Attack as a Combat Techer. It's pretty challenging.
I believe this is the best way to go about the course if you plan to solo it yourself. Feel free to study it and use it for your own TACO ventures!
This video was taken from my occassional PSO2 livestreams: www.twitch.tv/kiyobi/c/1992961&utm_campaign=archive_export&utm_source=kiyobi&utm_medium=youtube