Many of the most well known professionals use and recommend measuring devices of all kinds, so I wouldn't sweat that issue. People use grids, calipers, rulers... whatever works.
You asked if there is a trick to getting facial features to look symmetrical without sacrificing likeness, and I don't think there is. It seems to be an either/or thing: perfect likeness or perfect symmetry. Otherwise you can pick a point somewhere in between, depending on what your goals are.
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