Writing, whether it's a novel or screenplay, is like trying to swim in the ocean. It's the hardest thing to do. I think it's harder than engineering. Not that it requires a lot of math but a lot of time, effort and patience to actually sit down and write. First you have to learn how to swim. If you cannot swim and get in the water, you'll most likely drown. Second, you have to learn how to stay afloat in the water for a long period of time. Third, you have to learn how to hold your breath. Fourth, you have to learn how to dive. Then, finally you're ready to dive deep into the abyss of the ocean where you'll find all kinds of interesting creatures that make good for stories.