Colonoscopy?

I am having a colonoscopy this week .My dr. is doing one to find out what is causing my cramping and abdominal pain. I have never had one done before (I'm only 25), but am worried--Will I be fully asleep during this or just out of it? I have read that ask people to move positions during this procedure, and wondered how people could move if they're awake. Any advice or info is appreciated. Thanks!