Shedding is typically an unmistakable event. Their eyes are noticeably milkier looking and their general appearance is duller, this is called the "blue phase". Then a day or so after this they appear to clear up, almost back to their typical look (often, not always). Then anywhere from 3 days to a week later they rub their nose to start the shedding process, typically at night as this is when most corns are active, but again, not always. Then in the morning you will find a fresh shed.
Note that all snakes shed, but all have their own habits of doing so, there is no "one routine" although it is in essence the same.
I suggest keeping a simple log book of "events". Just a date and when/what they ate, when you noticed them blue and when they shed is ample information. This will come in handy as time goes by. You will be able to predict an oncoming shed to within a few days in most cases. This log will also help explain a forgone meal for no "apparent" reason.
Everyone with multiple snakes will testify that all corns have their own routine slightly different from the others. Some will eat while blue, others flatly refuse anything to do with food, some hide, others carry on as normal etc etc. So there is no "this is what s/he WILL do, except that they will go blue, then rub to break the kin from the mouth/nose area.
I still find it fascinating to see their own personalities during this time, eg, 1 will have nothing to do with food 3 days prior to going blue, then still not eat for 3 days after shedding. Another will still eat at the peak of "blueness" when I'm sure it can barely see anything.