Look for DJMP2 not for Fever. Cause you can't solve all missions without cheating, really. Example: You must fulfil Fever 5x(?) in a low-lvl song where you can only get Fever 3x(?) even if you 100% it. It been awhile when I played Fever. My PSP is broken so (DJM's fault O

... I need a new one-.-
It can be easy to start with 5k and 6k to learn 7/8K, because it's not THAT difficult. Its just a question of training and how fast you can recognize the falling middle-notes.
7k ist that:
+1|5K|+1
8K is that:
+1|6k|+1
That diagramm shows that you dont have to learn from the beginning. (like from 4k to 6k), so you have a good base to start with.
I can also just say: Train every day and you'll see that you'll get better!