Standard tuning: eadgbe
Just keep playing this part throughout the whole song!

E|-------------------------------------------------------------------| 
B|-------8---------8-----------10---------10-------------------------| 
G|-------5---------5-----------7----------7--------------------------| 
D|--5--2------5--2--------7--3-------7--3----------------------------| 
A|3--------3---------3-5----------5----------------------------------| 
E|-------------------------------------------------------------------| 

That's Just about it. Not too hard. You can change it up by doing this: 

     p   .5    p   .5      p   .5     p   .5 
E|-------------------------------------------------------------------| 
B|-------8---------8-----------10---------10-------------------------| 
G|-------5---------5-----------7----------7--------------------------| 
D|--5p2-------5p2---------7p3--------7p3-----------------------------| 
A|3--------3---------3-5----------5----------------------------------| 
E|-------------------------------------------------------------------| 

Whatever works for you. There are also other ways. You can use a hammer-off technique instead. 
|p - Pull-off 
|h - Hammer-on