28 sessions of x-ray EBRT for me. For prep, I was told they wanted my rectum empty of both fecal matter and gas, and they wanted my bladder "moderately full." I ate a diet that helped assure a bowel movement each morning. Wound up giving myself an enema three times when the BM didn't seem to completely empty me out. They wanted me to finish drinking 20 ounces of water 45 minutes before my treatment (and of course, don't pee). None of it was particularly bothersome. And the treatments themselves were simple - less than 10 minutes on the table, no muss, no fuss, no pain. No change of clothes - just lower my pants a few inches and pull up my shirt so they could see the markers on my hips and belly to get me lined up properly.