Before I knew there was a taxi on Korriban that took me to the lower part of the valley, I resorted to jumping off the cliff and trying to catch ledges. It finally worked after dieing a lot but I deleted my character when I couldn't find the way back up.
Another time I went all the way through Balmorra with choosing my advanced class.
I also remember the time I got to level 16, was dressed in all green quality gear that wasn't even for my class, and thought I was bad@ss.