I don't think I would've plopped tons of old books in front of my wife and expected her to become a professional and experienced Princess overnight. I think the idea is to help guide her myself. I would've helped coach her in speech making, the art of small talk when on official engagements, State matters, etc. Anyone can drop tons of books before you to read but I think it makes a difference when you get out there and just do the work with your spouses guiding hand.
It took Diana several years to find her way as the Princess of Wales and future Queen but she did it. With years of experience under her belt, she went on to do a good job in her royal role.
Love, time and patience makes the difference, IMO, because before they became engaged, Charles helped guide his second wife. Before they became engaged, the Duchess of Cornwall accompanied Charles to official engagements and she learned things way before her marriage. I think maybe Charles and even palace officials learned some lessons along the way.
"The truth, I think, is always fair even if it hurts. But misrepresentation, is to me, injustice. It isn't fair, so therefore it is not digestible."
The Honourable Frances Shand Kydd