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It isn't so much that it is hard, it is a case of how much you are put off by the potential hard work. How much drive you have regardless of the challenge.

It is some religious monasteries or teachers they use this to weed out those that they figure might not be up to it. They come to the student and say "You know if you are to get this, it will take over a decade or more before you will even begin to get the ideas we are working with!". If the student is not worried about this and see it as merely what needs to be done to get to their goal - then they will be a good student. The barriers are not seen as a problem but a process.