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im guessing cant, u if u havnt already, put ur exhaust on, fit the bumper and mark where the exhaust hits, measuring is another good way if uve got a good head on ya or yeah guesswork only ways i can think. as for cutting it out im not to sure but for be id get the general shape then wack a circular scotch bright abra disk in a drill and slowly smooth it to prefered shape. dno if that helps
Remember always start far too small, then work away at it checking with the exhaust until you have the correct sized hole. Much easier to sort it being to small than too big.