Steve, the book is a good start and the instruction is good as well. Being that I've had first hand instruction and experience, with the Bargue plates, I am of the opinion that the sight size approach should be made easier and it has been. Not everyone can jump into the site size approach while standing at a distance. So, I propagate the sitting down approach for at least three plates. When a student has come to understand the working method that the Bargue plates teach, then one is ready to do the site size at a distance but from a casts and in charcoal.
All the best to you and your boy and let me know if I can help
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