January through early-March in zone 8 on the west side of the Cascades is a good time to prune blueberry shrubs. I have assembled several good helpers that are easy reading and will get you prepared to do the job yourself.
Prune Blueberries — OSU Extension article, and attached to it is a good pdf guide you can download.
Prune Blueberries Video — This is from U of Maine Extension, but other than the timing of pruning, it’s great info.
Prune Blueberries Video — Another really great pruning video from Penn State.
You shouldn’t need more than these 3 resources and a nicely sharp pair of bypass hand pruners, and maybe a pair of loppers.