in Pakistan absence of LAW & insurance issues you will end up in serious trouble for a self-driven rental vehicle.
Rental companies do zero maintenance on vehicles and you will come to know of problem at a breakdown when you are in middle of nowhere
I suggest RENT-A-CAR with driver.
You pay for fuel and food to driver rest is the driver's responsibility. Incase of break down, you can walk without any damage. @ammadqureshi thread can tell you the tale