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What they said...Also I wouldn't worry about hydrated lime going hard, it's not cement. Even when used as a lime mortar to lay bricks, it can be recycled years later simply by crushing it up and adding water again.I have a PH tester, the type with a prod that you stick in wet soil. I'd maybe mark off a square yard, sprinkle an ounce of lime at a time taking a reading after each ounce until it reached the desired level. Then spread however many ounces it takes per yard over the rest of the area.
I would give you links but I am on my iPad at the moment and I haven't figured out how to place links on it.