The melody of O Holy Night by Aled Jones runs 158 notes across 87 bars, 2:51 long in D at 99 beats per minute. The tab sits almost entirely in the first two frets, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? O Holy Night chords and lyrics.