OK so I purchase a new pistol and I take it to the range for the first time. Naturally it feels different in my hand since it is a different size, or whatever. My question is what is the best way to determine with a new gun if the sights are set properly from the factory or if they need to be adjusted? How can I tell if it is a sight problem or the way i am holding/shooting the pistol? What distance should I be shooting the pistol for the first time to determine accuracy?