I agree with Aquarius on this. All hypnosis does is brings you into a trance. When we consider the pendulum swinging that hypnotists use, this is very much akin to entering a trance as described on the JoS website; a repeating pattern that brings our mind into an alpha-wave state.
To enter a trance we input a repeating pattern into our conscious mind which further connects our 'logical' mind to our subconscious mind. Essentially our conscious mind becomes quieted, thus in affect amplifying our subconscious mind. This allows us to program said subconsciousness via affirmations. Our subconscious is the route in which we can better connect to the ethereal realm.
I'd also suggest meditation over hypnosis because it teaches us how to manifest our own reality, whereas hypnosis is a form of conditioning via triggering autonomic responses. It's brainwashing and it can (for some) be damaging in that it alters our mind against our will and our awareness, whereas through meditation we are in complete control.
When we meditate we have the ability to influence the energy inside, around and outside of us. I also don't recommend holding LaVey's teachings to heart. Albeit there may be tiny bits of truth, the reality here is LaVeyan Satanism is opposite to Spritual Satanism in many regards. This is the kind of Satanism that the elites incorporate; allowing for things such as child sacrifice and such. This comes from the concept 'do as thou wilt'... a very corrupt and immoral philosophy of which has no place in Spiritual Satanism. We follow natural law, yet we also follow the principles of what is inherently just and righteous. Satan and our Gods show us truth and the path to what is right.
I'd recommend reading some works from Fredrick Nietzsche to gain a better understanding of these ideas.