Dave, not sure if the 06 and 07 are exactly the same or not. You should turn the key from "OFF" to "Accessory" and turn everything off. I think this is just to relieve the fuse from a load and not to cause an arch (pitting the fuse prongs) when it is removed or reinstalled later. Start the engine and let it run for three minutes being sure you go from a forward gear into neutral and NOT from reverse to neutral. Turn the engine off and remove the ignition fuse stated in the manual. turn the key to the accessory position so the steering will not lock into place. This is how we do our 06 and I think the 07 is the same; the steering lock may be the only difference but the rest should be the same.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7