How to mentally prepare for a new post is always a challenge. Or, more precisely, how to not look totally clueless about your new post is always a challenge. Usually you can bluff through the average conversation by reciting Led Zeppelin lyrics:
"Wow, Pakistan, eh?"
"Yes, I am a traveler of both time and space."
"Are you nervous?"
"Ooh, yeah yeah, Ooh, yeah yeah."
And so forth.
I like to take a more literary approach: there are many very detailed, thoroughly researched books on Pakistani military and political history, and if you look intent enough while you read them, no one is going to bother you with questions to which you don't know the answer. This is yet another way in which paper books are superior to a Kindle.
If you get really stuck, though, you can just change the subject:
"Is Pakistan landlocked?"
"I don't know. Want to hear about Jordan?"