Not sure if excited would be the right word in my case. Determined, maybe. I have trouble getting up in the mornings, especially this time of year, so when shot day is coming up I get in a mindset for it. I mentally tell myself things like, "I WILL get up immediately when the alarm goes off and do my shot. I've done this every time before. I can do it." I do my shot first thing to make absolutely sure I can't forget it.
CursedFireDean, is your anxiety over the pain, or over fear of screwing up the shot somehow? I'm always a tad nervous that I'll botch it. Having a very specific routine helps me, as well as reminding myself I've done it successfully x number of times already. Another thing that helps me is accepting that I'll be anxious, but knowing that anxiety itself won't stop me from doing it anyway.