You can get much better at achieving ANY goal when you write about that goal. This is because once once your goal is written down on paper (paper is better for this process than a computer, go figure), all your niggling doubts about the goal will float to the surface, like ice cubes in a glass of mineral water.
Deal with your doubts: write them down
Here's the thing about doubts: they can only hurt you when they're unconscious. Let's say you want to write a book in 2007. Great goal. You're excited. You imagine yourself as a published author.
Write down both the goal, and the doubts - I won't have the time , I can't write an entire book, what if my mother/ significant other hates it, etc.
The doubts, written down, will make you uncomfortable. The next day, they'll seem so stupid that they will make you laugh. It's true - try it. There's something about writing things down that shrinks them. Monsters look like cute garden gnomes.
Notice that you don't have to DO anything about your doubts, except write them down. Once they're written, they melt and disappear, just like the ice cubes.