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I've tested a motorcycle that had a pencil sized hole in it and still had a reading of 10psi, so if you doubt your compression tester then check the same cylinder twice.
pulling all the plugs, wires and coil wire is a good idea to prevent damage but most people don't bother, nor do they see negative results that are strong enough to tell them that they are doing it wrong, but it's still a good idea, jumper cables to a 2nd battery seems a bit much, just make sure your battery is fully charged and you should be fine fore 10 minutes or more of cranking.
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