What comes up as maintenance calories for the general population that has your weight, might end up being below or over maintenance. No magic number of calories that you can calculate will be your exact number.
The best thing to do is analyze your current diet and see if you are doing things right for your goal. If not, you would have to adjust (add protein, calories, etc.). The book has a premise that you are not eating enough, which doesn't have to be the case. I would personally save myself a negative experiment, as I know how unpleasant it can be to gain instead of lose in an effort to do things by a book or a by a formula. So step one: analyze what you are doing now, if you can't do it yourself, there are plenty of us here that can help look at your food.
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