At the beginning is a little bit complicated to square strokes with lyrics... but listen to the song, and try to finger-pick without thinking about matches. ...soon you´ll figure out that pattern in "2nd" and "3rd" string strokes combined with thumb at every chord change is the key for the whole drawing. And when sustained-singing words just keep the beat in the finger-picking. Perhaps this is the most difficult part of all the song, but don´t think too much and try keep t (azchords.com)