Richard
The Book of Thoth is the best Thoth book. A lot of people whine about not being able to understand it. There is no excuse for that. The only way to obtain the necessary background is to learn the necessary background material. It's as simple as that. There is information galore on the internet: Astrology, Alchemy, Qabalah, Hermeticism. It's free! If you don't wish to put forth the necessary effort, that's okay too. One's time is often not free. In that case, just don't worry or whine about it, or complain about Crowley's writing style. That's a cop out. If you want to learn, you will; if you don't, you won't. It's mostly a matter of priorities, and that's strictly a personal affair.