This is my first tab so be nice :P
first do this holding an Am shape on the third fret
e|-----------3-------|b|------4--------4---|g|----5----5---5-----|d|-5-----------------|a|-------------------|E|-------------------| Repeat X 10
Then move up to the 7th
e|------------7---------|b|-------8----------8---|g|----9----9----9-------|d|-9--------------------|a|----------------------|E|----------------------| Repeat X 2
Then move up to the 9th
e|-------------9---------|b|-------10---------10---|g|----11----11---11------|d|-11--------------------|a|-----------------------|E|-----------------------| Repeat X 2
Then return to the 3rd
e|-----------3-------|b|------4--------4---|g|----5----5---5-----|d|-5-----------------|a|-------------------|E|-------------------| Repeat X 4
and that's pretty much it
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