I think that most of it isn't that hard, but there are still definitely parts where someone would get confused without an explanation. For example, if reading it according to modern English, Galatians 2:6 makes it look like Paul loses his train of thought midway through the sentence, because it says "seemed to be somewhat" and then never says what noun the word "somewhat" is modifying. But back then, "somewhat" could be used in the sense of "something". Swap out "somewhat" with "something", like the NKJV or 21st Century KJV do, and the passage makes more sense.
(granted, I still think "seemed to be something" is not the greatest translation--modern usage of "seemed to be" carries a note of skepticism that I don't think was conveyed in the original Greek, so something like the NASB's ""were of high reputation" gets the meaning across better. But "seemed to be something" is at least comprehensible, unlike "seemed to be somewhat")
Really, much of this problem could be fixed if editions of the KJV, like modern printings of Shakespeare's plays, included footnotes explaining what obscure words meant or indicating that a word's meaning had changed... for example, a footnote after "somewhat" that said "something" would immediately explain the situation. You don't even need to change the text. But I've never seen a KJVO suggest such a thing.
