I’ve learned that Isaiah really isn’t that hard to understand. You just need to read slowly and think about Nephi’s statement that the words of Isaiah are plain to those who have the spirit of prophecy. To me the spirit of prophecy is in comprehending the overarching themes, truths, principles, and destinies. Furthermore, there seems to be only a handful of themes that Isaiah discusses: (1) the wickedness of Israel, (2) God’s revenge against Israel, (3) God’s forgiveness and redemption of Israel, and (4) the Messiah. You give the guy the benefit of the doubt that he’s not crazy and there is a fabric of logic behind the sometimes seemingly random string of poetic images and dialogue, you ask yourself which of the categories the current subject fits into, you look at the big picture, and suddenly it makes perfect sense.