i follow the practice of hiving packages similiar to what apis does. i spray a little water when i get them, and if it's hot i will again, or as apis said during transportation. i wait until later in the day. pull 4 frames from the center, pull the syrup can. i put the queen in her cage aside or on top the frames, shake them in. leave the box next to the hive with any bees who quite don't want to leave for a little bit, they do shortly. replace the frames, and set the queen cage in. i slow release all my queens, but that is because i keep russian bees now. i have a time or two added a little hbh, or sugar to the water spray. like apis said later in the day, minimizes flying and also drifting.
powdered sugar. it has been mentioned not to use 'store bought' powdered sugar to dust the bees with for natural mite 'control'. not to open a can of worms here, but the small amount of the corn starch in the powdered sugar that one would dust their bees with is not enough to hurt them. feeding them powdered sugar yes, dusting them with it no. i guess i would ask how much is being dusted on them? you don't need more than a cup per brood box or even much less. you don't need to saturate them. just my humble opinion.