An art teacher ran an experiment in his ceramics class. He divided the class into two groups. One would receive their final grade based on the quantity of pots they were able to make: for example, 50 pounds was worth an A, 40 pounds a B, and so forth. The other half of the class would be graded on the quality of only one pot; it had to be exquisite.
And the experiment began...
The first group made pot after pot, some small, some large, more, more, more.
The second group strategized, studied the ceramics of the masters, sketched and plotted, calculated, planned, and finally each made his one pot.
So which group won?
Interestingly, the group that was judged on quantity also ended up with the highest quality pots. The second, strategizing, group found their pots beset with mistakes that they hadn't anticipated. As the first group made pot after pot, they also learned to better produce works of art.*
*a story from John Ortberg's If You Want to Walk on Water, You Have to Get Out of the Boat.
The moral of this story is that if you want to accomplish something, you must do it! Don't talk, don't take classes, don't read books about it, unless you also start producing attempts. Yes, your attempts may stink, and they are hard and impinge on your schedule, but they are also the only way to become better. If you want to write a novel, then start by writing: emails, grocery lists, little scenes, anything. If you compose beautiful music, then write a million songs and record the best.
Don't be someone who in ten years looks back on today and says, "Oh, if only I'd done this..."