It's so extremely condensed and generalized that you will have to spend months just figuring out stuff Franz Bardon only wrote like 2 sentences and briefly mentioned in his book. e.g. that mystery of water thing? There's entire books dedicated to that and it's just briefly mentioned in IIH. IIH basically is basically a good layout of the path of development for a wizard. Everyone should read and start working there way through IIH, as they grow and develop and understand more, it will lead them to high levels of attainment. You can't rely on IIH alone though, there's a shitload of study and introspection and work to be done, in order to realize everything written in that book.
Also post questions in the question thread.