A better, more natural-sounding way to clean up a voice recording, though, is to paste in strips of 'silence' that showcase your home studio at its best. To do this, wake up early (ie. when your house is quiet), turn on your gear and set your levels for a normal job. Then record a full minute of silence at whatever bit depths and sample rates you're likely to be using. Repeat this process for each different mic you use, and save each file in a folder titled Room Tones, or something similarly suitable.
If a client likes your demo, they may invite you to audition. In the 21st century, you can download the audition script, record the audition at home, and then send the results to your client over the Internet. Prepare yourself for a life of constant auditions: Even successful voice pros may do many more auditions than actual jobs. But if enough jobs come your way, it's worth it.
You will never have to answer to a “boss”, but you will need to be your own boss and manage yourself. You will work on your own a lot of the time. So you need to embrace the benefits and the challenges this presents. Take courses in areas where you need to develop your skills. When you adequately prepare for running a business, you will succeed in its management, even if part of managing your business means hiring out, in areas that you know are not your strongest.
The point is each person can often have a different perspective on how they ‘bid’ for work. Another factor is how you work within an industry if you have a really high profile. For instance if a big car manufacturer chooses you, you’re not going to get any kind of work from any other car manufacturer so you’re alienating yourself out of the rest of the market for the big players.
As editor, you need to turn the raw recording into the final version of the file you'll be sending to your client. Editing during a recording session can be problematic, and particularly so if you're recording in a domestic environment. How can you expect to hear the drone of the dishwasher ruining your recording if the dishwasher is still running as you edit? I'll look in more detail at setting up a voiceover recording studio next time, but for now, if recording in a separate room or isolated booth isn't an option, at least try to edit the file the following morning (or maybe at night) when there's less noise around — because hearing your recording with a fresh ear and in a quieter environment will help you to make better editing decisions, and will reveal noises that slipped your attention earlier. 
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