TGS is not necessary for all magick. Deep trance is required mainly for evocation to physical manifestation. However, Alpha is all you need for everything else, and we enter that every time we “zone out” watching television.
Try some of these methods:
Don’t get caught up in thinking you always need a deep trance. That is a mistake.
However, you naturally enter Theta every night before falling into sleep so…
When you feel yourself sliding towards sleep, try to extend the in between state for as long as you can using your conscious will. This is the hypnogogic state, the border between Theta and Delta, where the spirit world opens up, and where disembodied voices, and shadowy shapes will manifest…
You won’t be able to hold it very long in the beginning, but with constant practice, you will eventually be able to hold it indefinitely. You can then anchor it to a gesture or a word and be able to enter it at will.
Another method is sleep deprivation. Aim for 5 days without sleep. Around day 3, trance will begin to come on, and by day 4, it will be almost constant. Again, anchor it to a gesture or a word, and you will then be able to access the same state at will.