All of the above things are just things that MAY happen. Also keep in mind that you are not alone as you work with your new dog. I cannot emphasize enough that if you are feeling confused, frustrated or down about how things are going, you should feel free to call your Pyr Rescue contact people. Rescue folk have a strong desire to see placements succeed, and dog lovers adore talking about dogs anyway. Now's the time where my obedience bias gets trotted out.
Any dog can learn basic obedience behaviors, no matter the age.
It talks about behavior, training, dog brains, and lots of other things. I cannot stress this enough. Because I've been there. Obedience training not only trains the dog, it trains the trainer. You learn valuable lessons in how dogs think and behave, and how to communicate effectively with them.