How can I make my potted poinsettia last?

I would like to have some poinsettias this Christmas. I live in a small, dark, north-facing apartment. Because there's another apartment block in front of mine, we don't get much light at all. But I have also heard you have to be careful not to water them too much. I just don't want to buy one or... show more I would like to have some poinsettias this Christmas. I live in a small, dark, north-facing apartment. Because there's another apartment block in front of mine, we don't get much light at all.

But I have also heard you have to be careful not to water them too much.

I just don't want to buy one or two and have all the leaves fall off before Christmas.
Any advice?
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