How to push/pull a section of part?

Hello,

I am looking to spread the fingers of this hand so they are further away from one another.  I was wondering if there is a way to toggle each finger and then pull or rotate them about where the fingers meet the hand (where the phalanges meet the metacarpus).  I was thinking maybe using the freeform or deform options but these features are still a bit more advanced than what I currently know.  I would be excited to learn these features however.  Thank you for any ideas or help!

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