11. Write Every Single Day
Writing is hard. For anybody who has ever sat down at a desk and tried to write something of the creative variety, you'll know how difficult the process is. That said, write every day. Write at least a page of your screenplay every day. It's easy enough to have it in your head and to say, "Oh, I'll put it on to paper later," but that doesn't mean anything. Some of the greatest ideas ever conceived have been in people's heads, but what use are they if they're never realised? Successful writing (in all fields, actually) really comes down to one thing: discipline. If you've any hope of ever becoming a screenwriter of the professional variety, you have to find time to write every day, because that's what you want to do for a living, isn't it? You can't get better if you don't write every single day because practice makes perfect. It's as simple as that. And the sooner you get that into your head, the better writer you'll become. Even after a month of writing every single day, you'll be a better writer than you were when you started. No doubt. That's guaranteed. Concentration and discipline are an inherent part of the process, after all, and it's all about
teaching yourself to be those things. When you have those nagging feelings telling you to do anything else but write after a day at work, ignore them. It's the way you've been conditioned. You'll know you're on the right track when you've reached a point where you can't help but sit down and write. Because you want to.