Reddit mentions of A Companion to Familia Romana: Based on Hans Ørberg’s Latine Disco, with Vocabulary and Grammar (Lingua Latina) (Latin and English Edition)

There is a companion to LLPSI that gives english info chapter by chapter: https://www.amazon.com/Companion-Familia-Romana-Ørbergs-Vocabulary/dp/158510809X

Why not use the supplement that was written for LLPSI? That's what I used and it works really well.

https://www.amazon.com/Companion-Familia-Romana-%C3%98rbergs-Vocabulary/dp/158510809X/ref=sr_1_2?keywords=lingua+latina&qid=1564764691&s=gateway&sr=8-2

If you're not already familiar with learning a foreign language, LLPSI can be pretty daunting without guidance. I would find a teacher or online guide as you read through LLPSI, or work through a few chapters of Wheelock's or something before starting into LLPSI. Personally, I love Jeanne Neumann's Companion to Ørberg.

>Is it really possible to learn Latin just by reading the lingua latina per se illustrata books?

It's possible to get started learning Latin using only those books.

>Are there any supplemental materials that you recommend?

The Companion to Familia Romana makes the grammar of the textbook explicit. I would avoid using it except as a last resort, but it's been invaluable when I've been stuck and banging my head against the wall.

If you can afford it, try out this excellent companion book: https://www.amazon.com/Companion-Familia-Romana-Ørbergs-Vocabulary/dp/158510809X/

It's no longer purely the inductive method, but these are well written and chapter-by-chapter related grammar lessons.