Intra-uterine blood transfusion for HDN? Will it hurt the baby?

Ok, so anti-E is a b9lood thing that develops in about 10% of white women after an intial pregnancy (meaning that you won't have it the first time around) but some 80% of men have anti-E. Apparantly, the doctors found the Anti-E in my blood, and did an amniotic panel (drew amniotic fluid from me to test it) and cam to the conclusion that the baby has a high risk factor for HDN (Hemolytic Disease of a newborn) and that it can destroy the baby's red blood cells. They want to give an intra-uterine blood transfusion to my baby, to stop/mend any damage done thus far. He will need another transfusion right after he is born. if it works, he should have few to no complications, if it isn't treated, it could kill him, but intrauterine transfusions are risky and can cause preterm labor. Plus, I think it might hurt him, being stuck with a needle while having his blood pulled out and new blood put in. has anyone had it done?