This another song that every guitar player should master. Play it slow and clean at first; memorize it. Speed will come with practice. It's best to not use your 4th finger on the Intro. Finger numbers are written below the staff.
This is the transition between the Intro and the Verse Rhythm, 41 seconds into the song.
Memorize the melody notes first.
Now add the "Pedal Tone" on the G String, 14th Fret.
The Chorus Lead is similar to the Intro.