this song is really easy 
Standard tuning

G|-------------------------------------------------------------------------|
D|-------------------------------------------------------------------------|
A|-0-4-5---5---0-4-5---5---5-4-2---2---2-0-2---2---2-0-----------2-0---0---|
E|-----------------------------------------------------3---3---3-----------|

G|--------------------------|   Repeat
D|--------------------------| throughout
A|-0-4-5---5---0-4-5---5----|    the
E|--------------------------|   song!