Good to hear your story Michelle and well done for accessing a recording of the Advanced 2 work! You are right in saying that the original manual is very hard work! I now use a combination of the old manual (the bible equivalent) and 'Notes for a Dancer' compiled by Shiela Kennedy. There's now a 7th edition but I had to order it from America...............
https://cicb.org/product/notes-for-a-dancer-7th-edition/
Julie Cronshaw's resources are good too for a flavour of the Cecchetti method. I found it interesting and the archive material is charming. However, some of her explanations on ballet theory and posture (especially ideas about where the centre of gravity is positioned or attainable over the foot and leg) is aligned to Roger Tully's teaching not Cecchetti.