Like Breeze said, you can just remove one plug per cylinder, cause all you are trying to do is reduce the pressure build up in the cylinder while you turn the engine over with the starter. The Ultima manual procedure for priming the oil system is essentially what was suggested above. Disconnecting at least the hot lead(s) from the coil means that you have no spark being generated. It is a good step if you can get to it easily. If not, just ground the plug wires (I just stuff them in the fins).
TQ
TQ