When Installing packaged bees: Place empty super on top of hive body with frames. Place feeder full of syrup to one side of super atop frames. Remove queen cage and place between a couple of the frames, screen side down. Invert package of bees alongside of feeder. Put on top and leave them alone for 2 days. On 3rd day remove empty cage and refill feeder. If you wish you can replace some of the frames in the super or even add more feeders.
The bees exit the cage in their own time will little or no stress. The beekeeper doesn't get stung because he's not agitating the bees.