Dear kelseygwynne,
To add to what others have said, I would underscore that donating part of a liver is, overall, a much bigger deal than a kidney. Because a liver can regenerate a missing piece, some people view it as the safer organ to donate, but the state of the art is in some ways less advanced than it is for kidney donation, and the risks of the surgery and the aftermath are higher than they are for kidney donation.
Whatever you decide, good luck with your decision.
Be well, Snoopy