Guitar Hero III
59 Achievements
1,000
Xbox 360
The Inhuman Achievement
Complete Through the Fire and Flames on Expert
15
How to unlock the The Inhuman Achievement achievement in Guitar Hero III - Definitive Guide
The beginning of this song is the hardest part by far. The really good players can beat it on a couple of tries through once they learn the start of it. Study the beginning and play it in practice a couple of times, if you think you have what it takes. If you feel you have the skill, go for it. There's not much I can say to help.
You can always try it with a friend, and have colours assigned for it to be easier.