Did you know that you can easily save certain bones into a group in Blender so that you can selected those bones quickly when needed? Simply use the bone groups feature to group your bones into different groups that can then be selected from the same bone groups panel. This comes particularly handy when using the pose library: you probably want to create matching bone groups for the poses that you are creating, especially now that the poses are only saved and applied for the bones that you have selected. You can even give different groups of bones different color to be able to visually separate them from each other.
Here’s the process of adding bones to a bone group:
1. Select the bones you want to add to the group (in Pose mode for example)
2. Create a new bone group with the + button
3. Hit the assign -button
Now you can easily selected that set of bones any time from the “select” button.