Great post @omfedor, upvote for you. You really explained this well with good examples. That being said, as a hypnotist with 500 hours of training,
I would like to clarify some points. We all go into a state of hypnosis many times a day; Switching between the conscious and the subconscious at intervals unique to each person.

When we repeatedly say a certain phrase, it becomes a keynote for our subconsciousness.

Saying a repeated phrase does not necessarily reach the subconscious; Especially if you have a pre-existing belief in your subconscious that is opposite to the repeated phrase or if there is no feeling/emotion behind what is being said. Like I said before we are constantly switching between the two state seamlessly. That being said, it is true though that saying a repeated phrase (Mantra/TM/etc.) is one of many methods to reach a trance state to better access ones subconscious to program/reprogram it.

Or when we say a certain phrase at the moment of emotional stress. Subconsciousness is open for programming during eating, dreaming, having sex, contacting with money, having frank, hearty talks, listening to music, dancing or singing.

Any strong emotional moment can access the subconscious mind to program it. Emotional stress is just one of the many emotions that have direct access to the subconscious. Also the examples you listed are good but should be mentioned that they do not apply to everyone. For example, certain people will not get an emotional activation from singing or dancing.

One last point I would like to add, despite popular belief, a person can not be made to do anything in hypnosis that goes against there core beliefs while they are in hypnosis. If a person is requested to do anything they normally wouldn't do they will either A) come out of the trance state immediately or B) not respond and will wait for the next suggestion.

If anyone has anymore questions about hypnosis feel free to ask, Cheers
@ballinconscious