From the inside...
...because then you get an accurate movement from the pedal, maybe you dont have enough travel, maybe you have thick floormats, whatever. A lot of times, the pedal will not push it as far as turning it by hand.
And its not really a "kickdown cable". It does a lot more than tell the car when to shift. It controls line pressure in the trans. If you try to make it shift too high (pulling it back too far) then you will not get the throttle blades all the way open on your motor. If you set it too loose, then you run the risk of burning up your trans because your pressure is too low. Dont treat it like a shift kit, because its not.
Like Zam70 wrote, dont take it too far off factory settings.