You will get away with it if you do it quickly and don't disturb the root ball too much. Have your new pots ready with soil available etc, so you can go straight from one pot into another.
And yes, ericaceous compost for the blueberries.
And, don't worry too much about watering them at the moment - if they aren't in leaf they won't need masses of water, and depending on how cold it gets round your way this Easter you don't want to allow the roots to get frozen solid.