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Begin at an edge: Trail the flattener behind you as you walk a straight line across the lawn. Bossard begins at second base and rides straight to the warning track in dead center field. Because this is the most important step, Bossard ties a string from his start point to his end point to guide him. “The truth of the fact is you’re basing your whole system on the first line. If you screw up one line the whole thing is screwed up. That’s why the night before, I don’t allow a mower to drink.”

Turn around: After the first line, go back against the line you’ve already in the other direction, going over the edge of the first line by two or three inches. Repeat until the lawn is done.