Certainly, there are people who manage to hang themselves without knowing anything concrete. Although I think it's always better to be informed.
Partial hanging has the difficulty of choosing a suitable position where you can apply the necessary weight to block the carotid arteries and achieve unconsciousness. And that the weight remains maintained over time and your body does not change position when you start to convulse. In addition to the usual key points: being alone, having time, and not being rescued, having an anchor point and using resistant materials that won't break.
But yes, the videos make it look easy since we only see the successful attempt. Some will be impulsive and others we don't know how many times they have tried ctb..