I have blueberry bushes and it's enjoyable to watch them get ripe. When I go to pick them it's too tempting not to eat some right from the tree. Blueberries stay pretty free from insects, birds will steal a few so I pick the deep blue ones everyday. They get sweeter left on the tree longer. If I'm planning to freeze them I let them sit in an open weaved basket in the indirect sunlight 2-3 days prior to freezing.
Simply place in freezer,using zip top plastic bags, do not over fill. Zip almost closed then gently press excessive air from the bag, finish zipping bag, and lay flat. Store in single file in freezer. Once they freeze you can stack 2-3 bags (maybe more if you have a lot of berries).
Remove just the amount your recipe calls for from the bag. Place in strainer and wash with cold water. Spread out on a clean cookie sheet so the ice cold berries are not stacked up. Give them a few minutes to thaw then use in recipe as directed.