Line 1 - So now to the fearful warning.

I believe the consensus on the "fearful warning" is that it refers to the part of the text before the pigpen text. Where it starts with "Abraham the Jew, Prince, Priest, Levite...". This might be corroborated by the monthly clue: "‘To find a description of what you are looking four. Three names for it are found in the books warning two its readers, before the encrypted words even start." This, however, is not entirely conclusive although it seems a likely possibility.

Is the first line of the 2nd second of the text asking us to look back to the "warning to its readers" here?

It starts to look like the text is laid out like this:

1st section (Terribilis Est Locus Iste) = a description of what we will find in the book.
2nd section (Solis Sacerdotibus) = the directions telling us where we will find it in the book.

Also quite interesting: The opening words, "So now to the...", can also be read as "Son of Toth(e)"...
Son of Thoth can also be connected to Thutmose, which has the same exact meaning.
Then of course, there is the monthly clue which points us to the tomb of Thutmose III.
Also perhaps interesting is that a little later we have a reference to Hermes "the Thrice Great."
Is there any connection between Thutmose III & Hermes Trismegistus? Maybe a stretch, but there are a few speculative theories about this already out there.....