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.
Sometimes chop them and sometimes burn them but most of the time scissors.
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.
you don't want to mix left and right wing or secondaries with primaries,at least I don't.
Pappy