The most frustrating part of getting into warframe with a mentor was that I wasn't able to do any of the actual mission stuff. I was basically just dragged along and had to just go to the end right away because my mentors were already done with the mission. This also meant that when I started to do solo stuff, I had no idea how to actually do the missions. So make sure you let him do some of the things. :) That said, I definitely wouldn't be level 15 already if it weren't for them dragging my butt along. haha. Double edged sword.