yeah it really also depends how big is ur tank and how much dead rock u putting in
soak it in water in a bucket in the dark for a couple of days and all the dead organic matter left inside will leech out in the bucket instead of in your tank. Otherwise you could see a spike NH4 levels.
soak it in a bucket with water circulation for a few days. Put a lid on it, leave it in the dark.
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+1 --- Add it slowly and over an extended period of time..a larger well established tank should be able to negate any ill effects of a cycle.
Unless you dont have any livestock in the tank yet. Then you may just want to put it all in at once..run the cycle and move on from there.