I take it one song at a time. Some songs are great in their original form, some have benefitted from repeated performances and "paring down". I learned the lyrics to "Wildwood Flower" wrong years ago and, although I keep the originals on hand because I'm a compulsive collector, I don't sing them that way because my version is more concise (the lyrics were never the strong point of that song, anyway). I've got all the words to the full version of "Engine 143" but the Carter version is MUCH less tedious and still gets the point across. Whatever works.