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If I recall correctly, you put in say a gallon or near two in each tank, then do the first reading, then you fill it, and do the second reading. It then does it's calculations and it should have a good or better reading then you currently have.
A campground with full hookups is a great place to do it. We're lucky we have a PVC poke through next to the house by the driveway. In essence we have full hookups at home (minus a 30a outlet).
If you screw up the first time, don't fret, you can't really break it. I was worried the first time I did it, but it's not all that bad, just a waste of water.
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