The lyrics are crystal clear when Bill Monroe sings them too. And, yeah, it's just your basic bluegrass chords. Piece o' cake. (Now the fancy pickin' and fiddlin', not quite so easy, of course.)
BTW, re the DT/Forum search thing, today I plugged in all these variations on the song title:
Christmas Time's A Comin' Christmas Time's A Coming Christmas Time's A Comin
Christmas Times A-Comin' Christmas Times A-Coming Christmas Times A-Comin
Christmas Times A Comin' Christmas Times A Coming Christmas Times A Comin
and some of them brought up one or two threads or posts, others brought up three or four threads and up to 9 posts, but all of them yielded something pertaining to the song - even taking me to threads/posts with different spellings. But when I searched for the song before starting my new thread this week, I used "Christmas Time's A-Comin" and got absolutely nothing. Strange.