In 1973, George Lucas began the treatment for what would become a defnining film for an entire generation - although it went through many titles and revisions, on the 25th of May, 1977 Star Wars was released. For the next two movies, he brought in a few others to help out with the writing and directing - Lawrence Kasdan and Irvin Kirshner amongst them.
The result of this was the creation of a movie series that became the modern-day fables - the ultimate and forever ambigious definition of the never-ending battle between good and evil. It was a defining component of an entire generation and had an impact that is yet to be seen again in popular culture.
Then, 20 years later, he began work on the prequels. However, by now it would seem that his ego had become as large as the influence of Star Wars, and he didn't collaborate with anyone else for the prequels... the result of which being movies jam packed with characters, poor dialogue, choppy storylines - and Jar Jar Binks.
He had effectively destroyed everything that Star Wars had become, and with each prequel it lost even more of it's luster.
Don't let this happen to you. Remember that times, people and situations all change - as do you. Don't be afraid to bring others in to help you with things are not your strength, don't be blind to your shortcomings, and keep your ego in check.
Work to preserve your legacy - or you run the risk of forever being remembered not for the amazing things you've done... but for your own Jar Jar Binks.