It takes technical study and lots of practice to become proficient in selecting and positioning lights, matching color temperature, and rigging lamps for correct exposure, but once you get it, it's fun. However, as with many other aspects of moviemaking, no matter how seductive the technical details of the lighting technician's craft may be, they will take you only so far.
Then the challenges become artistic.
In fact, of all the moviemaker's storytelling tools, lighting is potentially the most powerful—because it's so painterly. Dialogue, performance, story, and subtext all play to our conscious minds—but images, painted in light, come in under our intellectual radar and can be unforgettable in literally wordless ways.