I usually cut to the length I want and glue them on full height,then cut with scissors,just be sure to use sharp scissors and try and make it in one long smooth cut.
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Sometimes chop them and sometimes burn them but most of the time scissors.
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The only problem I see is you don't get but 9 primaries out of a wing
on a grown Tom and 8 on a Jake so depending on 3 or 4 Fletch you can't do many arrows with 1 wing.
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you don't want to mix left and right wing or secondaries with primaries,at least I don't.
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Pappy