There is a printable version of Hokes book available on the forum, I like my commercially printed book and still think the money I spent for it was a good investment.
If you wish to do this as a hobby, Hokes will give you the basic principles you need and also help you understand the languages we use, so that you will be able to carry an intelligent conversation about this topic of recovery and refining precious metals with other forum members. Study of the forum will give you an understanding of electronic scrap, fill in a few gaps that Hokes did not teach, and give you a place to learn just about everything where these precious metals are concerned.
Welcome to the forum, you picked a very complicated subject for a hobby, but if you like learning and the yellow metal you have picked a great place to learn this new hobby.
To get the furthest the fastest in this field, starting with the books and study (not with the acids), will get you closer to melting that gold in your dish. Than would losing gold in the acids, and having to search the books to find where all of your gold is disappearing to.