Don't let the pinch harmonics get you down!! lol.. If you've finished both fundamentals, move on to the rock course, that's the next logical step. Then as you go along, check out the 'Metal' course under 'Lessons' and you've got a slew of material to pick from. I also did a brief lesson on pinch harmonics when you feel comfortable enough to revisit them: http://www.youtube.com/watch?v=fNhxMfCJf_Y
They may be easier for you after you've got some more playing/technique under your belt, they're really a feel thing that just kind of happen after you keep trying, like learning to whistle.