The melody of O Come, All Ye Faithful by Rebecca St. James runs 184 notes across 49 bars, 3:53 long in D at 110 beats per minute. The tab sits low on the neck, mostly under the fourth fret, 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 Come, All Ye Faithful chords and lyrics.