Aaron,
I'm so sorry that your Dad is sick and in need of a liver transplant and that you as a family member feel pressured to donate. You said I've volunteered to donate half my liver to my dad. I'm cool with the idea,. I think a lot of donors feel that way initially. You want to help, you volunteer and then find out what is involved and it scares the heck out of you. Like Fr. Pat, I am a living kidney donor, which is a less complicated surgery than liver donation, especially liver donation adult to adult. You are right to be nervous and anxious about having elective surgery, and elective surgery that is so invasive. I don't know much about minimally invasive liver donation surgery but if it is a new procedure then it is only as good as the surgeons doing it. It takes proficiency. If you were having surgery for your own physical benefit, you would most likely get a second opinion, seek out a hospital that has a good track record in the surgery you were having, make sure you really understood all the complications that could happen to you. So treat this surgery like that. Seek out a second opinion from an institution who is not involved in the surgery, seek opinions from another surgeon, one who is experienced in the surgery that you are more comfortable with and weigh the pros and cons.
Always remember that you are able to decline at any time during the work up and the team will tell the recipient that something came up during the testing that makes you ineligible to donate. I know that seems difficult for families and especially to a parent. But sometimes, I'm not sure recipients understand the ramifications of living donation and are very focused on their disease. The doctors keep stressing how much better a living donor is and the long wait list for deceased donations so it is hard to imagine anything else. As a healthy person it is hard to be in the recipient's place in a desperate situation. Try and seek out help from a social worker or psychologist who might be helpful with this big decision. Also ask the hospital to put you in touch with other donor who have had both negative and positive experiences. This might be more realistic. There are a few liver donors on this board and you can try and contact them.
Good luck with your decision and keep us posted.
Sherri