Robbing is a shock so be prepared. It can kill a new colony in a few hours. A dearth can happen for several days even in spring. Know where your entrance reducer is. Better yet, get a robbing screen, you can always keep it on with 3 gates open, and close the gates when trouble starts.
If you are going foundationless, peek in the lid to make sure the comb is straight and your frames are pressed together tightly. The new comb will be like warm marshmallows in this heat, so be careful if you have to straighten something. If you gave them frames with foundation, that's easier, and then I'd leave them alone for a couple of weeks.