It depends on the book. E.A. has over a dozen books out now, and some are designed for beginners, a couple are full courses and some assume a background in ceremonial magick. I don’t have this book so I’m not sure what prerequisites it has.
All of them, as most modern grimoires do, assume you have your protections and cleansing techniques understood. Doing magick sort of lights you up on the astral and attracts interest from astral entities. LIKE ATTRACTS LIKE… If your work is positive you have little to worry about.
On this forum we have a few tutorials collected to give you these basics - at the very least, be able to feel the ambience or presences in a room, calm and ground your energy, cleanse and ward your space, and banish.
The top three I always recommend are spiritual hygiene, developing your astral senses and learn how to get rid of impostors and parasites in case you get any. (Most people already have some as a natural consequence of living.)