Just for the sake of completeness for the memories, nothing to read here but the remaining section titles and opening quotes. Because you can simply never have too many Buffy quotes, I find. I will spare you my scattered notes, because I trust I can find those if I'm ever seized with the urgent desire to finish this thing.
A perfectly reasonable and not at all insane explanation
Giles: Poor technique. Prioritizing, sub-par... Execution was adequate, but a bit too bloody for my taste.
Buffy: Giles, don't mention it. It was my pleasure to make the world safe for humanity again.
Giles: I'm not saying that your methods are without merit, it's, uh, you're spending too much time and energy. It should simply be: plunge and move on. (Never Kill A Boy On The First Date 1.05)
A natural at the supernatural
Giles: You know this is very dangerous.
Buffy: Ah, you just heard the horror stories. Wear hoops, they'll catch on something, rip your lobe off. Lobes flying everywhere.
Giles: That's not what I'm talking about.
Buffy: You mean Spike not having a chip. Free-range Spike?
Giles: I have to ask-why on Earth did you make that decision?
Buffy: Guess it was instinct, like you were talking about.
Giles: I made that up! I knew the Bringer was there because his shoes squeaked. (First Date 7.14)
II. The expert on weird
Buffy: The question is never "what do you think," it's always "what do you know?" You gotta know it. If you don't, if you make one mistake.... it takes just one vampire to kill you. So you've got to know you can take him. Know your environment. Know what's around you, and know how to use it. In the hands of a slayer, everything is a potential weapon. If you know how to see it. When you're fighting, you have to know yourself, your brain, your body. Know how to stay calm, centered. Every move is important, every blow's got to be part of your plan 'cause you make that one mistake, and it's over. You're not the slayer. You're not a potential. You're dead. (Potential 7.12)
Wow, rereading all this really makes me miss the show.