All the best with that Great Teacher. Some initial pain and anxiety but after the operation you will reap a better and more productive life. Having a blood transfusion definitely not a good idea though! I recall my father back about 30 years ago had an internal bleed and was told he needed a transfusion. The doctors said he was likely to die without one.
He refused and the doctors went ahead and respected his wishes. The doctors and nurses were amazed how well he recovered and he lived on to be 86. Anyway stay positive and confident as your surgeon no doubt has years of experience and highly skilled in his profession. Let us know how you go mate!