how do you disable the ignition system to bleed the bleed the hydroboost system? on 2003 Ford F-350 Super Duty

I am installing a new hydroboost system an it requires me to disable the ignition system and still crank the engine. I would normally disconnect the battery cables to do this but it wont crank without power. Any suggestions

Asked by for the 2003 Ford F-350 Super Duty
Look in owners guide for inertia, or fuel cut off, switch (right kick panel maybe) tap it to trip and shut off fuel, when finished push button to reset.
Wouldn't that run it out of fuel when it starts?