"This was Alfre Woodard's audiobook directing debut, and she pulled an amazing performance from people. The big [thing] was to remember that these stories were being told in intimate settings, one‑on‑one in most cases, so the talent really needed to speak to the individual listener. An image kept in mind was stories being told around a campfire, back when folktales were passed down by spoken word.” 

It's a good idea to record with one ear free from your headphones, as this helps you to deliver a more natural performance.When recording solo, I find the role of director the hardest to play. How can you lose yourself in the moment if you're on the lookout for mistakes? If you stop each time you mispronounce a word or use the wrong intonation, your spoken‑word recording will sound choppy and unnatural. It's for this reason that I like to record each job twice. The first time, I push the director out of the room and focus on the message. If possible, I even let the soundtrack of the video I'm narrating play quietly in my headphones, and I don't stop for mistakes any more than I would if I were telling a story to a friend. During the second take, I let the director back into the room, to make sure I pronounce everything correctly and emphasise the correct information — though I still try to keep the performance honest and natural.
Once you’ve identified a pool of candidates based on skills and availability, look at their experience and browse their gig gallery. Listen to samples of previous voice-over work to get a sense of their style, and choose the candidate whose style you like best. You can contact them before ordering, explain your project requirements, expectations, and budget, and provide examples of work you like by the seller or someone else as an audio reference.

At this point — unless you're tracking for broadcast applications (where they don't work to peak levels) — consider 'normalising' your recording to an optimal level. Normalisation can be used to push the loudest peak to around ‑1dB and increase the volume of the entire recording by the same ratio. Of course, you can also tighten up dynamic range (the difference between the softest and loudest parts of your recording) by manually reducing the loudest sections of the recording before you apply normalisation. On a final note, if you do plan to use a compressor, then you might as well add gain at that stage instead of normalising.

"Ideally the talent should be seated, staying on axis, approximately a foot away from the mic, which should be angled back from the face a bit, not parallel to it. You'll need to see what angle provides the best results, usually a few degrees off from parallel works great — and located between the forehead and the nose, not directly in line with the mouth. This will help with plosives, mouth noise, and some other issues. Movement in the booth should be limited, as the microphone is likely to pick up arms flailing, hands rubbing, page turns, stomach growling, and so on. Keep the levels consistent, moving closer if the scene calls for a whisper, or moving back for a loud voice or scream. A well‑versed narrator is capable of delivering a dynamic performance without creating dynamic levels.”
The clarity of your voice and a comfortable volume may be the most essential parts of great audio. If your voice over recording is fuzzy or muddy sounding, it will be difficult for people to understand. Audiences likely will be distracted and unable to absorb the information or may simply move on. Either way, they miss your message and you miss an opportunity to share what your knowledge.
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First, since you’ve decided to use professional talent rather than record your own voice over, you know the challenge is to find a person whose interpretation of your script and voice quality represents your brand. You might have a list of qualities — female or male, a mature or childlike voice, a certain accent, authoritative, and so on. This is your voice profile. It’s best to start with this list already defined so you can easily narrow your results.
Keep it respectable and charge what your time and services are worth. That means establishing some minimums. For example, you might set a minimum price of $100 per job. So if the client says they can get it done locally for less than half that price, you explain that they are getting a professional recording and the difference is in the quality of the recording.

As the engineer, your key job is to select and set up the recording space, choose and position the microphone, set levels and make sure you're recording a good, clean signal at a healthy level. Like music, the louder the signal you want to record, the less audible the noise floor, but you don't want to have to speak louder than sounds natural, and you don't want to overcook things when tracking: any distortion will be very noticeable on an exposed voice part, and an otherwise great take with digital clipping won't be acceptable. If you notice clipping only when you start editing, software clip restoration tools might help to make the take usable, but it's not going to be perfect. Remember that although you may have needed to record 'hot' on analogue tape and older 16‑bit digital recording systems, modern 24‑bit A‑D converters can accommodate a much wider dynamic range, so you no longer have to track so loud: you can leave much more headroom.