The intro is very easy! 

 Play it in this G(230033)


E------------------------------
B----------0-------------------
G-------0--------0-------------
D----0--------2-----2--0-------
A------------------------------
E-0---------------------------- 4x

 Remember since you are picking in G, it is really not
 played open. I thought it would be easier to put it 
 in that G. Now you only have to move your index finger
 to the fourth string and back to the second! I love 
 this song!=)