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General rule of transplanting anything in active growth:
1. Dig the hole first be tidy about saving the clean dirt, meticulous about getting rid of weed roots, especially quackgrass and creeping buttercup.
2. Wait for a cool day, or at least one with no wind.
3. Water the plant you're digging up heavily the night before.
4. Cut a line around the plant at the drip line.
5. Have a wheelbarrow, wagon, or burden cloth ready to carry the plant, and right next to where it's growing.
Do the next steps all at once and as quickly as possible
6. Using a spading fork, loosen the dirt at the cut line and angle in under the plant.
7. drive a round-nosed shovel down and then in all the way around the plant.
8. Using both hands, grasp the base of the plant right above soil level and tug gently. If it moves easily (and Blueberries especially, and most plants that have only been in the ground for a year or two, will be out at this point) put the shovel back into the ground and lift and lever it out of the hole into your carrying utensile.
9. Put the plant in the new hole, and then water the dirt from the hole in under the plant, using a shovel or spading fork to wiggle things around until the plant is firmly in the fround and there are no bubbles showing.
You can dig two holes at once but after that you need to do the whole transplant for each plant before you go on to the next. The whole point is that plants need to be out of the ground for as short a time possible.
If you can wait until they're dormant, it's a lot easier, you don't need to dump water on them, and can work with more plants at once.