My hiking partner was very good at navigation. But, we would get frustrated with Roper’s book. Roper would say things like “this is easy to see or straightforward which way to ascend and descend etc”. It was not very obvious to us starting at the pass:-) So that would lead to some frustration. We didn’t use compass much. I had the route downloaded into my Garmin watch and Caltopo app. I remember Knapsack pass – we thought he asked us to go up the scree field on the left. If I remember correctly, there were two scree fields separated one above the other by talus etc. We tried that and it became sketchy. So then we had to traverse to the right and somehow made it. So, such confusing things will happen all the time. Just don’t get frustrated and take it slow and you will make it. In general, Roper’s book is really really good.
Whitebark pass or maybe it was Blue lake pass was very difficult. In the sense, you know the difficult passes and you prepare for it mentally like Frozen lake pass (which I thought was not that bad going up or even coming down) etc But, the easy one sometimes gave us the most trouble probably because we were expecting it to be easy and it turned out to be difficult.
Unfortunately I lost all my notes due to the offline crap of google maps. Otherwise I could have shared more.