Congratulations! I donated non-directed 14 years ago, when I was 56. I'm doing fine at 70, still running a slow half-marathon twice a year here in Japan.
Each hospital has its own policies about meeting before surgery. Some hospitals encourage it, feeling that it promotes healing. Others forbid it, concerned that perhaps the potential donor will back out for not liking the race, religion, ethnicity, politics, etc. of the chosen recipient. Or fearing that money may change hands. All sorts of people in the world. I know of one case where the proposed RECIPIENT backed out after meeting the proposed donor, because that donor clearly expressed his presumption that OF COURSE the recipient would join the donor's Church after the transplant.
So, just go along with whatever policies your hospital has. Each system has its pluses and minuses.
You might want to also post at the FaceBook page of Living Donors on Line, as these days many more donors check in there rather than here.
Please let us know how it goes.
best wishes,
Fr. Pat