The sign of an experienced developer is solid design. Novices edit examples they find on the Net, journeymen figure out how to code something as they do it, but craftsmen plan their work. Starting out, this can look like wasted time, but if your app is any good, your customer will want to expand it. Then, if you need some help, you'll have to explain all that intuitive code to ten people, all of whom you are paying by the hour. Diagrams would be nice then, right?