Summarize:

Like a sunflower that turns to face the light, a Norfolk Island pine will grow or lean toward light sources. To prevent the tree from growing irregularly and becoming lopsided, turn the pot a quarter turn every week. Be careful not to jostle the tree too much when you turn the pot, as these trees don't like to be moved. These trees do not like temperature extremes, and will not survive temperatures much below 35 F (2 C) or above 85 F (24 C). The ideal daytime temperature is about 65 F (16 C). The perfect nighttime temperature is slightly cooler, around 55 F (13 C). While these trees do like cooler nighttime temperatures, they do not like sudden changes. A shady corner in a sunroom is a good spot for this type of tree, since the nighttime temperature will naturally drop when the sun goes down. In their natural habitat, Norfolk Island pines grow in a tropical location by the ocean, so they like moist air. The ideal humidity for these trees is 50 percent. You can maintain that humidity by misting the tree daily with room-temperature water, or by installing a nearby humidifier. It's especially important to provide additional humidity if you live in a cold or dry climate. This type of tree doesn't require cosmetic pruning. The only pruning you should do is trimming to remove branches that die or tips that turn brown. Use sharp pruning shears to trim dead foliage. When you prune a Norfolk Pine, you prevent the cut point from growing any more. So instead of encouraging new growth, pruning will force growth to occur elsewhere, and this will change the shape of the tree.
Turn the tree regularly. Maintain the right temperature. Provide the tree with additional humidity. Trim only brown or dead foliage.