My dh was fearful the first time around too. Thankfully he respects me and my body enough to know that I wouldn't make this choice if I didn't believe it was truly the best choice for me. We made a deal that he would learn more about it, and if he still had reservations we would discuss it again. Once he learned more about WHY I wanted to UC and he discovered that all the info backed me up he was less afraid. This time around he is so relaxed, he loved our last UC (and thought it was SO much better than our hospital experience) and is looking forward to the whole thing again.
I say knowledge is power. Educate your fearful dh, he may surprise you in the end