Do what you love to do and give it your very best. Whether it's business or baseball, or the theater, or any field. If you don't love what you're doing and you can't give it your best, get out of it. Life is too short. You'll be an old man before you know it.
Writing about someone well known removes that obligation of defending it as a subject, but it also means that some of the surprise and freshness is already gone. It's so different - in some ways much harder for me.