Blueberry bushes

me and my cousins usually pick them to make some money to buy stuff, last year they were to small and the plants were to sparse to make it profitable

I have over 500 blueberry shrubs,bushes,trees,whatever,they are 12 -14 ft so they surely look like trees.Anyways I may have to take out 30 or so for a driveway and I want to know if its worth the money to try to transplant them.They are 10-15 years old and I sell them by the gallon.It will [...]

I want to maintain or increase yeild next year.

They are currently under the house eaves and I want to expose them more to the rainwater.

When is the most ideal time of the year to prune blueberry bushes located in the Pacific Northwest?
Thanks