I wrote the parts by viewpoint. Meaning that for Part One, I wrote Kaladin straight through and then Shallan straight through. And then I switched for Part Two and wrote Dalinar and Kaladin, and then I switched back. So I did write the storylines individually by viewpoint, but in sections by part.
Hmm…is there anything that was harder? You know, revisions are always hard. In the next to last draft I changed Dalinar’s arc very substantially, and that was a hard write. And, you know, Adolin was not originally a viewpoint character, so there was a lot of hard writing there. So, poor Adolin probably gets the badge for hardest to write. Not because he as a character was hard to write but because I was having to repurpose scenes and toss out scenes and rewrite them with Adolin as the viewpoint character and so on to add just a little more dimension to Dalinar’s plot arc.