If you grow blueberries in pots you will have to transplant every 2-3 years and they seem to do OK.
I would follow similar to Tee Gee, but would be inclined to wait until dormant as with trees and shrubs.
They really do like acid, even more acidic than ericaceous if you dare . See you are on heavy clay, as am I. Have very little depth of topsoil, so with our blueberries I have dug down to the clay pan (less than 1 1/2 feet), lined the hole and backfilled with ericaceous compost. The clay has helped keep the compost acidic and just top up a couple of inch each year. The lining has also helped minimise ingress of grass and raspberries from sides. They have grown really strongly over the last couple of years giving good crops.
I treated in a similar manner as I have when planting up other fruit and took it as an opportunity to prune as well.
I currently have 2 additional, fairly small, bushes that had previously been in the ground that I moved into pots this year as they were infested with couch grass. Washed the roots off, pruned and potted for the year. They have doubled in size - so all I would say is go for it!