How to reinstall water pump pulley?

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Have the Toyota Repair Manual. Replaced water pump and timing belt. Reinstalling all the stuff removed and at the step where it says "Install the Water Pump Pulley," they say to "carefully jack up your engine" (already removed the right motor mount and rear insulator) and put the pulley back on. But the engine would have to move three to four inches to get the pulley on. Will something break? Are they serious? (I am jacking from below using a block of wood under the oil pan.)