What to expect during colonoscopy prep?

I have a colonoscopy scheduled at 1:30 tomorrow, but they want me to be there at 12:15. I don't mean prep as in the laxatives or the no eating, but the nurse said this 45 minutes was for "prep" and I'm not sure what to expect beyond changing clothes? For reference, 17 year old female, first... show more I have a colonoscopy scheduled at 1:30 tomorrow, but they want me to be there at 12:15. I don't mean prep as in the laxatives or the no eating, but the nurse said this 45 minutes was for "prep" and I'm not sure what to expect beyond changing clothes?
For reference, 17 year old female, first colonoscopy, and they'll be putting me under some form of anesthesia so I'll be entirely unconscious.
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