Dear fairymeadow,
you are talking about many different things - I will try to say my point of view, although I am not a hypnosis expert

I don't believe, that our mind is the source of all around us -
the source is "ALL".
With our minds, or better said with our believes were are able to realize the many manifestations of "ALL". The more we become capable of leaving old patterns of believe and behaviour behind, the more we will be able to be aware until we realize, that everything is already inside of us, but we forgot about it. Our (different) lifes are the opportunity to re-discover of what we are - until we realize, that there is no difference between "us" and "ALL there is".
And as well, that inside/outside is the same

Intent and affirmation - for me it is not the same.
Intent is something coming from my heart ... directing to someone or something. The intent is an "order" to my Higher Self. The Higher Self is the opposite of my subconsciousnes- although both have to work pretty well together to be able to manifest what I am intenting
Affirmations are directed to my subconsciousness, where everything is stored we have experienced so far (during our many lifes). So there we also find our patterns of believe and behaviour.
Using affirmations is not that easy as many people believe it is, and that's why many people say "with me it doesn't work out".
If our believe is "it's cool to be poor" ... nothing can change this believe as long as we choose to believe it. You may affirm thousands of times the sentence "it's cool to be rich" - nothing will change, as long as you don't believe it and as long as you believe that "poor is cool"
This is, because our subconsciousnes ONLY works with what it already experienced and validated as "true".
So, when using affirmations there's some more work to do, in order to convince your subconsciousnes. Reiki can help to transform those believes, especially with the mental technique or with the mental-symbol - AND of course in meditation.
You might say, that affirmation is some kind of self-hynosis, or hypnosis "light"

Therapeutic Hynosis is something similar but on a much deeper level. But even there, you might need several sessions until something starts happening !
Symbols and hypnosisFor me it has nothing in common, because using the symbols I am in a state of awareness and intent. Using or drawing the symbols with no intent ... nothing will happen. So, the symbols are the carrier of my intent and of the energy the symbol has on its own.
Try to experience the difference:
simply draw a circle = what happens? You draw and see just a simple circle.
And now draw this circle with the awareness of "never-ending creation" ... and feel what happens inside of you.

The more you do this, the more, this circle will be charged with this energy you are feeling.
Well

I don't know if I can make clear, what I mean

Looking forward to read from you all!
Blessings
Petra