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Get a lazer operated level system like the surveyors use to set your grade board's height, and measure not only the full square of the project, but cross corners also to get the project truly "square".
Tie a string line on the first post you set to the other corner marker on that side and attempt to move every corresponding post around in the hole to just graze the string while level, so while standing back, you can see that they all line up perfectly....it makes for flat, unwavy sides, and a stronger barn.
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