Perfect, but how do you use these models? Are you supposed to know all 100's of them by heart and then, in the middle of conversation, go: "Ah, but X principle

Perfect, but how do you use these models? Are you supposed to know all 100's of them by heart and then, in the middle of conversation, go: "Ah, but X principle says Y, therefore we will go with Z option". Is it? Am I missing something? I mean, I'd love to use this but I don't have enough brain cells for all of those :)