In olden days — say, 5 years ago — home recording studios were not common among voiceover talent. Today, though, having your own recording studio has become a necessity to compete in this industry.
I am meticulous about editing out undesirable sounds to provide a pristine recording to my clients. This :41 video shows you how to isolate and eliminate a click from your recording. I use Pro Tools LE, but this technique should work with any audio editing program.
Since editing is done in real time, you can just imagine the amount of time needed to edit your recording of a long video or e-learning narration, much less an audiobook! When quoting a price for a job, you always have to factor in the time required to edit the audio. In fact, the general rule of thumb that I use is to expect 2 hours of audio editing for every 1 hour of finished recording.