How am I going to get through this???

I knew a few days before school recessed last semester that I, and a few others, had been selected to participate in a cadaver class. There were only 8 of 50 individuals, who signed up, selected. This would be a once in a life-time opportunity for me and I couldn't pass that up. Needless to say, when my name was picked, it felt like i had just won the lottery. Through the summer, the cadaver class was on my mind. I was very excited; however, the second I walked into the cadaver lab today the elation of it all vastly disappeared. As my instructor was showing us the room and pulling out all the different tools we would be using, my eyes drifted to the giant freezer in the middle of the room. I think we all know what was inside there. The body came out, we unzipped the body bag, cut away the mummy wrapped gauze and exposed the body. The reality hit me that I was supposed to cut open this poor dead man and I haven't been able to come to terms with this yet. It's one thing to talk about doing something like this and another thing entirely to actually be there seeing Adam (that's what we named him) and cutting open his body. Does anyone have any comforting thoughts or motivational speeches, because I am feeling very unsure of all this now. I don't want to lose this once in a life-time chance and I am not one to give up, and I know I will end up enjoying it, but in the mean time...HELP!!