When I had mine...I really didn't feel anything but a mild pressure...but then it could have been the drugs they gave while I was in the hospital. I didn't feel the needle, I felt the fluid being drawn out which was strange. Then pain was very minimal.
Just drink plenty of caffiene, take a couple ot Tylenol extra strength, advil, etc and you will be fine. Just imagine us all there telling the doctor exactly where to stick the needle.
Bet you won't be worried at all...lol