As Nike says "Just do it". That's the best life secret I can give you. You have too. Not in all things but in anything you dream of you need to just do it. Think about it all you want but that won't get you anywhere. Action is what gets you to where when you want to go.
Procrastination kills dreams but so does the fear of failing. Think about it this way, what is the most you will lose. Invest in your future. Seriously, failing is not the worst thing you can do. Not succeeding is. I was listening to a webinar the other day and he gave a great example of whether something is a failure or not. Thomas Edison had over 1000 unsuccessful attempts at inventing the light bulb. When asked how it felt to fail 1000 times he responded with "I didn't fail 1000 times. The light bulb was an invention with 1000 steps."
That's the same thing with writing, new career, new business. You just keep on it until you get it right. It's not failing, it's finding out what works best for you and what your dream is.
There are so many things in life you should give up: eating unhealthy, smoking, drinking, being a couch potatoe, drugs, negativity, but your dreams you should not give up on not ever.