I mentioned in my notes on lesson #1 that I like to picture and even map out the structure of text, but I also find it useful to mark out who’s talking when there are multiple speakers.
Below is a PDF copy of 1 Nephi 11-14 with all the dialogue color-coded. The angel doesn’t have much to say at first, but monologues quite a bit in chapters 13 and 14.
Some of this attribution is speculative or convenient, though, so take it with a grain of salt. For example, in 13:34, I have “Behold, saith the Lamb of God” as spoken by the angel, just to make it clear that the angel is quoting the Lord there, but that phrase might very well be part of the Lord’s statement–in fact, it probably is. Ditto in 14:7.