I never gave Nina panadol beforehand, but always made sure I had some at home just in case. The 6 month needles were the better ones though. Within 2 minutes of getting it, she was sitting on my lap in the waiting room lauhing and talking to everyone. We couldn't believe that only minutes beforehand she had her needles! If you are nervous/tense about it though, it might be best for someone else to be in the room with her. Your partner, mother or someone. I've always had either my DH or mum hold my DD as I'm a wuss.
Good luck, and I'm it'll all be fine.