How do I give my characters all different voices? (In a story I am writing)?

I am trying to write a story switching between a bunch of different friends all telling the story from first person. I was thinking of switching every couple of chapters and above each chapter would be the name of the character telling this part. I am unsure how to pull this off though and am seeking advice. Thanks... show more I am trying to write a story switching between a bunch of different friends all telling the story from first person. I was thinking of switching every couple of chapters and above each chapter would be the name of the character telling this part. I am unsure how to pull this off though and am seeking advice. Thanks in advance :)
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