Having done that a year ago I can confirm the process is the same, essentially you bowels are emptied out with an extreme laxative then you are asked to not drink anything but small amounts of water.

In my case I was still running to the toilet a half hour before the procedure any time I drank anything.

Had to get a general anasthetic because I’d tried it while awakepreviously and the pain was to much and I couldn’t take it.