You must concentrate hard during the initial years, as the training will hold you in good stead in the future. Patience and perseverance are key qualities that you must develop.
The extremely long hours that one has to put in can be quite a bother. Lack of social life is another issue. You will be at the beck and call of your guests at all times. One of the biggest misconceptions is that one can lead a very glamorous and easy-going life in this field. Nothing can be farther from the truth. Your job can very well become monotonous if you don't improve yourself.