Hi Niel!
First, congratulation to your Glock 17. It´s a superb gun for self defense purposes!
Until yet I´ve bought three brand new Glocks (17, 19 and 26), and I can´t remember one single failure or problem with on of these guns.
Also I´ve never heard that there exists a break in period with glock pistols.
But I would recommend that you train regulary, and in the beginning a lot, if you have bought it for SD.
Especially when you have owned other pistols before, because not everyone likes the trigger of a glock! So it´s very important to get used to it!!
I wish you a lot of fun and joy with your austrian lady!