You really won't find a lot of in depth information about Schutzhund online or in books. You can get a lot of general information, but there is nothing like actually talking with people that do it and seeing it in action. It's very hard to explain online what the drive looks like that is necessary and what exactly the trainer or helper will be looking for out of your dog and it really does take someone seeing your dog work.
The truth is...the biggest thing isn't having the right dog. Its YOU having the dedication to train and keep going. Schutzhund takes a lot of time, and isn't just a one time a week training session. That's probably the biggest hurdle most people have, its dedicating a lot of your personal time to the training that your dog needs to succeed in the sport.
CD RE TC HIC 7/10