I also encourage you to look up the facsimile in his hand which is floating around online. Sheet Music: Villa-Lobos Collected Guitar Solos (Eshig) via Amazon. The B section is a bit more straight forward.
For the A section: the three statements of the melody and linking parts. I break down the A and B section into smaller chunks.I give a brief overview of the piece in terms of a large two sections (A section and B section).The main thing I discuss is the form of the piece but my video lesson is laid out in this format: Lesson: Prelude No.1 by Heitor Villa-Lobos (1887-1959) for Classical Guitar – It’s a 30min video lesson so here’s the outline.