In this question, I posited the existence of a form of magic that can be used by a practitioner to connect with a subject's mind at touch range, and effectively give an experienced, powerful practitioner total control over that person's mind (and body by extension).
In that question, I asked how a practitioner of such magic could drive someone insane at a later date. Now, we have the same practitioner who needs to quickly cure a friend of a phobia, in particular a fear of heights that relates to a near-fatal fall in early childhood.
This practitioner could simply delete the causative memories and any other memories of being in situations where acrophobia caused a problem, but since the person suffering from the phobia is a friend, the practitioner wants the treatment to have the smallest possible impact while still being effective, and such wholesale editing of memories could well change the subject's personality in undesirable ways.
It might be easy to say "The practitioner just makes it happen", but this magic requires details. Memories can be investigated, added, removed or altered, and the final personality post-treatment is dependent on the individual's genetics plus (now altered) life experience.
The individual in question is acrophobic due to the emotional response to a severe fall, and save for that experience would be no more acrophobic than the average person, i.e. the average person doesn't really like heights, but can cope with being in high places.
As in the previous question, this treatment can and must be effective in a single session.
How can a practitioner who can investigate and modify a person's mind at-will cure a subject of a phobia (specifically acrophobia caused by a childhood fall) with minimal side-effects to the subject's mind?
The answer with the lowest impact on the subject's memories and personality will be accepted as the answer.