Its not so difficult to play this little ditty by the Velvet Underground (written by Lou Reed at the age of 19).

You've listened to it a thousand times before, but you might need to listen to it again, closely.

The slow, soft parts go like this:
strum the D chord, pluck string (3) (2) (1)(2)(1)
strum the G chord, pluck string (3) (2) (1) (2)
strum the D chord, pluck string (3) (2) (1 with the pinky on the 3rd fret and then pull off)(2)(1)
strum the G chord, pluck string (3) (2) (1)(2)(1)

The hard parts are just strumming, of course.

And that little break between the verses where the chord pattern breaks and it crescendos in pitch is just sliding the D chord up so the top fingers are on the 7th then 9th fret.

As for the chords, here they are:

       D    G
(1)-|--2----3---
(2)-|--3----0---
(3)-|--2----0---
(4)-|--0----0---
(5)-|--X----2---
(6)-|--X----3---

Songs written by junkies are usually really good. E.G. The Red Hot Chili Peppers and the Pink Floyd.

Oh heroin, deliver me from the ugliness of the world. See also the Tao Te Ching