Some writers get their name emblazoned across their piece. Others, however, stay quietly in the background and allow someone else's name to adorn what should have been their byline. Yep, they're ghostwriters and it can be a lucrative business.
Writing Like Someone Else
The biggest mistake inexperienced ghostwriters make is trying to write like the person they're ghostwriting for. While mimicry can work for some very talented writers, it's a bust for most of us. If you go this route, it's not uncommon to end up with stuffy, stilted prose, almost like you were thirteen and trying to sound like a writer you just read from a textbook.
Instead of doing that, it's better to write like you normally would. That's what good ghostwriters do. Produce the best type of material you can using your own voice and attribute it to someone else. A well-written piece that sounds different than the writer it's attributed to is loads better than a poorly-written one that attempts to copy their style.
Changes, Changes
One reason why doing it your way makes sense is that clients will ask for changes according to their vision anyway. If they want it to be more reflective of their style, they'll tell you exactly what needs to be remedied. It's a positive for you, either way.
You Can Still Be Yourself
Even as a ghostwriter, you can still be yourself. There's absolutely no need to be anything you're not. Continue to let your voice shine through and use your customized writing software, as you would if it was your name in the byline. Your client will actually appreciate it.