I'm neither a breeder or a trainer ( except for my own pooch ) but as far as your question...
- I've been informed that GSDs have both a very high prey drive and an extremely strong will that makes them difficult to train. Is this true?
If in fact this is true, the offsetting attribute GSDs have is their incredible ability to be trained and learn...so I would say they are not "difficult to train" whatsoever. They are an incredible quick study. This is what my experience has taught me. What I find to be truer and truer with each GSD I have had over the years is the limiting factor in my dog's abilities is not due to the dog but is due to my lack of ability in properly training the dog. The more I have learned has only brought my dog to a higher level, so....as they say, " the ball is in your court".