My sincere concern for you, Zuzubu, is that from your responses and questions here, that you may decide to try it, just out of curiosity. Concerns of the afterlife aside, there's a lot that could go wrong with this. First off, there is no such thing - none whatsoever - as a reputable book on the subject. I don't say this just because I am no longer a follower, but because even when I was, it was the truth. Any text on magic is conglomerations of symbols, interpretations of past practices (usually quite wrong), and author musings on how things may have been possibly done at one point of time with absolutely no historical basis, just guesses. Actually I can only think of one text that has come down unchanged, from the 1500's, but that one was written by someone who took a LOT of drugs and by historical accounts was being led on by a scam artist.
Secondly, many "instructional books", with the intent of sounding scary or authentic, urge the reader to do things that are downright dangerous, such as cutting themselves or mixing up herbs and ingesting them or rubbing them on their bodies. More often or not the author has no regard to the health effects of such things, and I have even seen books suggest that people take herbs into their bodies that are downright dangerous; even worse, they suggest that people go out and pick them themselves, and most people can't tell spearmint from poison ivy, never mind actually tell if the plants grow in their area.
And last, "magic", in any sense, is purely psychological. This goes from trying to make someone fall in love with you to Sigfried and Roy and their tigers. Magic is nothing more than convincing yourself something has happened, or will happen. That's it, that's the big secret behind magic, and anyone who tells you otherwise is lying or misinformed. It can be being convinced someone has cast a spell on you, in which you are likely to then look for anything negative to blame on it, to convincing yourself that you cast a good spell on someone to make them healthy, in which case the person may believe they are now healthier, and recover. But there is no such thing as a rich witch, as they say; I've never heard of anyone who uses magic actually winning the lottery, which if magic worked, would happen all the time!
Knowledge is a good thing, brother, and I commend you for looking to expand yours. But please take it from someone who has been there, done that, and gotten the T-shirt . . . this would be a road that nothing good would come of. At the very least, you would be wasting your time studying something that is just plain false from every angle; you would be doing just as much good to yourself studying the Harry Potter books as if they were non-fiction. And at the worst you could convince yourself it was actually real.