The chords aren't difficult. The first chord is a C which is hammered on at times. You also have to first play an upstroke and then the downstroke.
like so:
--0--0-----0---0--------
--1--1-----1---1--------
--0--0-----0---0--------
--2--2-----2---0-h-2----
--3--3-----3---3--------
and then the C chord without the hammer on 4 times. Then it goes to G and then to F then back to C. Okay, I did it with the lyrics so it should help. There's no variation beyond this as far as I can tell. Tell me if it helps or whether you want it differently.
C
I'm thinking today of friends that I used to know
C------------------------G
Who lived and suffered in this world below
--------C----------------------F
They're gone off to heaven, but I want to know
C--------------G---------C
What are they doing there now?
----F---------------------C
Oh, what are they doing in heaven today
---------------------------G
Where sin and sorrow have all gone away
C--------------------F
Peace abounds like a river they say
-----C------------G----------C
Oh, what are they doing there now?
sorry about the lines but I couldnt get the chords to stay in position otherwise.