Sweet revenge
The chakra spinning should be done for aslong as it takes to make that specific chakra spin.
At first they don't have to spin fast, just get them moving. You probably won't feel anything if you haven't openened your chakra's yet, so that it natural.
Try to vizualize the chakra you are trying to spin as a pyramid pointed in the direction the chakra should be pointed at when correctly alligned, and then spin the piramid in the direction that feels most comfortable.
The first 10 times are the most difficult and it might take extreme concentration to get them to move even a millimeter, it was a real struggle for me with some chakra's (the crown, throat and heart), but after you get this initial spin going it will get easier and easier.
Void meditation is the same, it takes continuous practice. In fact I only mastered it about a month ago. Before I was adapt at it I had already opened my chakra's and empowered them, the void meditation was simply too tough to hold for a long time for me, untill recently when I finally got the gist of it.
Just do the best you can and everytime you mind wanders of be strict to yourself and pull yourself back into the void and throw away all the thoughts in your mind. Eventually you will be able to do it at will and even in extremely noisy and crowded places, but this takes time and patience.
Have you listened to the THOTH mantra audio? If not try to listen to it and vibrate it with the audio, for as many times as it takes untill you get it right. The first time I tried THOTH it took me 14 tries to get the right pitch and it took me about a week before I got the gist of it and started vibrating the mantra correctly.
Practice the mantra and try vibrating other mantra's to get a feel for the vibration and how vibrating words of power works. You use different parts of your mouth and throat than when you talk and it is a little finicky to grasp at first, but once you do you can't go wrong with it anymore.
Satanism is not an easy path, only with consistent meditation and patience aswell as discipline, a strong will and a strong desire to become powerful will you progress fast. If you lack any of these things now, don't worry as they will develop the more time you spend meditating and advancing yourself.
Everyday you put effort and energy into your advancement, even if it seems you are not making progress is still taking you closer to Satan and the gods aswell as taking you closer to the godhead.
For me the first 3 months were slow going, but after a while everything just clicked and fell into place and now I am advancing at a ridiculous pace. You just need to get the gist of it and then everything else will become easier and think positively, don't tell yourself that you can't, tell yourself "maybe I'm not that good yet, but I'll get it right next time and I'll make sure to become a god within the next 20 years"
Satan hears your desires and when you proclaim your wish to become an immortal and tell him aswell as show him you are willing to work hard for it he will support you and help you along the way.
I proclaimed, out of respect for Satan that I will aim to one day become his equal, no matter how long that may take or how hard I need to work for that, but it is my honest wish and only desire to eventually become an equal to him, to show my respect and then at that time be able to repay him equally for what he has done for me and to forever be by his side as a loyal friend and brother. Satan hears you when you say this and when you are genuine about your desire he will help you reach that point, as he has helped me so far.