You can just play power chords for most of these. I kept some extensions I thought I heard,
but you don't need to try too hard to play the 9th on the A9 for example which is already
in the vocal line. It'll sound good either way. Also you can try substituting Bm and Am for
D and C if you like it better sound wise or in your fingers.
For the D6 to D/D5 to G bit you can just play a normal D both times, but if you want to keep the
resolution in the guitar line you can do XXO777(D6) to XXO775(D) to maybe XXXOO3(G) or whatever G
you like with the G note on top. This will sound cool if you decide to vary the vocal line the way
Sam Reid does in a further verse.