The first half of the song is not too terribly tricky. I'm going to touch on a few different sections, and you'll find those sections highlighted in the tab below.
While you learn this song, don't be afraid to implement your own interpretations, adding your own flavor with different techniques (vibrato on chords,etc.)
This is a good way to start working on the thumb hit + notes strumming and trying to calibrate your strumming to strum only the notes you want.