This is a problem known as "bad writing" which I continue to struggle with, even after many years. Can you list the first part where you felt lost? Somewhere between there and the previous part, I must have skipped something.

I do hope people appreciate that all the "blindingly obvious" parts are parts where (at least in my guesstimation, and often in my actual experience) somebody else would otherwise get lost. The "obvious" is not the same for all people.