Maybe I am a bit odd but I do mine in a particular way.

1) Slot the control surface for the hinges. Be sure the hinges slide in and out smoothly.
2) Iron on a strip of covering to the leading edge of the elevator/rudder, and a strip of covering onto the trailing edge of the stab/fin. Make small slits into the covering where the hinges go.
3) Test fit the hinges again into both surfaces. When satisfied with the fit and the flexing permanently glue the hinges in place.
4) Push toothpicks vertically into the balsa and into the hinge to help secure it. CA the toothpick, cut and sand smooth.
5) Cover the remaining surfaces as normal.

This serves two purposes.
1) Gives the added strength of the toothpicks holding the hinge in
2) No worries of dripping CA onto the finished covering as you sometimes get when installing hinges after covering is completed.