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No, 4 points nowhere near enough. Try to get as many points as you can. In a night, you should get at least 6-10 points. But that means pulling an all-nighter. However, you can get some idea if you do what Rob said. Take a number of points each night, for consecutive nights. Try to get some both at minimum and maximum light. That way, you get points at the top and bottom of your lightcurve and you can then extrapolate a curve from these. Don't forget to get points at either side of the eclipse as well. Excel isn't the best for extrapolating curves with and the less points you have the more jagged and wonky your curve will look.
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