I can't stress enough the importance of reading the manufacturer's instructions when installing new floors. You may like to read — as evidenced by your reading a dry article about floors — but that doesn't mean your installer does. If you have your doubts, look up the instructions online before install day. Tip: Some manufacturers recommend you orient the flooring according to the dominant light source in the room. In this picture the front door casts a flood of light on the floor. This oak floor was sanded and finished onsite, so the direction the boards run in looks good. However, some prefinished floors look better if the boards run with the light.