It used to be said that, "them that can do ... them that can't, teach". I am sure that this is unfair to modern teachers, who do a difficult job under difficult circumstances.

A contemporary update on the above phrase might be, "them that can do ... them that can't, set themselves up as 'alternative therapists'". I wouldn't touch people with the proverbial 'barge pole'!

Therapy administered by trained professionals is a different matter.