So this should really be the main guitar part you hear in the beginning and so forth...

Tuning: E, A, D, G, B, e

e----------------------------------|
B-----5p4h5----------5p4-----------|
G------------------------5---------|
D----------------------------------|
A--0---------0-2-3-----------------|
E----------------------------------|
   .         . . .
Legend:
. (below number= palm mute)
p (pull off)
h (hammer on)

...that's pretty much it. (I'm doing this from memory so there may be tiny mistakes) But 
all should be right!