It may be crazy but it was one of the best decisions I ever made.
I donated a little over a year ago. I didn't know the woman I donated to until the night before surgery, she lives in WI, I am in OR but we are "family" now. I have never once regretted donating.
She did not know I was a potential donor until after my full physical evaluation when I contacted her for the 1st time. Mayo (and probably everywhere else) will not give the recipient any information about you, including that you are considering donation. You can start the process and change your mind at any time. If you don't match, you can still donate and be part of a chain donation, where your "person" is guaranteed a kidney from someone else because you donated in their name.
I started with an online form, a nurse called to talk with me about donation and was sent a blood work kit to complete and send back. From filling out the initial form to going back to work after surgery took about 4 months. Some of the down time was because of my schedule, some was because of hers. Scheduling and health issues are different for everyone, so timing is also different.
I had a days worth of routine appointments (gyno, flu shot etc) here, went to Mayo for a 2 very full days of evaluations, had a few more tests the day before surgery, was in the hospital overnight after surgery, spent 10 days in Rochester (didn't want to fly right away) and 2 more weeks at home recovering. It was about a month out of my life and it saved someone else's. I'd do it again but need the other kidney right now.
There are risks with any surgery and they did ask if I was planning on having (more) children, I'm not so I don't know how much difference that makes.
Just considering donation and talking to people helps spread the word about live organ donation so you've already done something positive.