When you are ready to start the magnum opus the Gods and or your Guardian Demon or Demoness, will approach you and let you know to begin the process. Keep in mind that it can take lifetimes, decades, or reach this point.
You also may be at a point where you don't feel ready, but the gods motion you to proceed.
Once the process is started as in the first steps, there is still very much alot of work to do to make sure things go smoothly.
The same can be said for working with the Kundalini. The initial rising of kundalini up and out the crown chakra is just one aspect of this process.
My advice to you is to be very dedicated to your spiritual practice and keep dedicated to your goals as a Satanist. The time will come if you work towards it hard enough.
This is all a very gradual working. It's to be respected and understood that it can take a long period of time. This is literally the evolution of a human being into a perfected God or Goddess. Take it very literally and comprehend the time frame can vary greatly.