One of the things making it hard to write here is how simple it all is. Many of us use complicated systems like the Qabala or study ancient writings until our left eye falls out. Many of us become religious and put ourselves through all kinds of dogmatic restrictions. Worse, many of us get initiated into various orders, cults and social clubs. Then it gets really sticky. We start to bash each other with shouts of 'you are doing it wrong'.
Newsflash: YOU CANNOT DO IT WRONG
Yes you can accidentally kill yourself with magick or someone else or cause severe health problems because you have no idea what you're doing. You can appear to set yourself back years, a decade or a lifetime. The unfolding will happen no matter what silliness you engage in.
Why then do we do all these things? We do them for the joy of active participation in our unfolding. We do them because we are compelled to evolve now, no matter what the price. We do them because we are ready. There is no other answer.