I had a colopscopy done years ago... basically it is just like a more in depth pap smear. From memory, my legs were in stirrups (fun!) and they had this thing that they looked at my cervix with... then the cervix was covered with an acid (like vinegar) which didn't sting, then they removed the cells which admittedly did sting a little, then it was all over.

Sorry if for being a little hazy... it was 7 years ago that I got it done.
I didn't need to go any further from there as my results came back as being fine.
Best of luck sweetie