It wasn't, and isn't, easy.
No it isn't; changing a mindset is very difficult. It was probably easier being young, not having the lifetime of thought pattern. The oldest had a about a year of frequent headaches in early adolescence. Had her checked out and there was no obvious physical cause, so talked to her about my experience, the psychology and self-fulfilling prophecies of headaches, and the impact it can have on life and relationships. It was something completely forgotten, until she was in her early twenties and something inspired her to thank me.