Other than there being a fair amount of it, none of it's rocket science, indeed I'd say it was no harder than school O'levels (uhm, do they still have O'levels ? ).
Accordingly, and outside of the horrendous (read, extortionate) cost, perhaps the hardest part is opening the envelope with the results inside.
However, and now for 'top tip #4278' : When said results envelope drops on the mat, hold it up to the light and if you see nought but white then you've passed. However if it's coloured then you've stuffed up, because along with your results it also includes an exam retake form for you to complete for another attempt !