It was the "in the future" logic (C Robertson comments), that convinced me to go with a tissue valve.Recognize, too, that life expectancy is based on experience, and the experience with these tissue valves is extraordinary. You will do fine.
I will be having my Aorta replaced and my bicuspid valve either replaced or repaired on Mar 26. I found out right after Thanksgiving so I have had a long wait. the past week it has hit me and like you I am getting scared. I wish I had some words of wisdom to pass on to help with the nerves, but I don't. Just keep reading all the success stories on this site. I have been inspired and have learned alot of things that I hope will help in my recovery. I have decided to go with a tissue valve if my needs to be replaced. My surgeon says that in the next 10 to 15 yrs there will be easier ways to replace the valve, and like you I have young children and I just don't want to deal with the blood thinners.
Keep the Faith and stay in touch. We will get thru this.