Well I'm not too sure simple is a good way to explain this book, as there is a lot of waffle in this book!
It's also pretty clear this is a book from someone who hasn't practised the art.
Yet it is a decent summary of other books.
Wouldn't recommend it to a beginner, but maybe for someone who can get out and looking for the potential of what to do in the astral realm.
If nothing else it's good to keep your drive for projecting going or just some light reading inspiration.
enjoy