"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.” 

When you come to actually recording your voice, try to think of the mic as the ear of your listener. Picture your listener, have an opinion, and read the script as if the words were coming to mind that instant. The distance between your mouth and the mic should be about the same as the distance between your thumb and pinkie when making a hang‑five gesture (see the picture above). Move closer to the mic when you lower your voice and back off when you speak louder. On‑line dictionaries such as the Merriam‑Webster one pictured here, often include audio examples which can help you clarify pronunciation. Just make sure that you use an American English or UK English (or other language!) version as appropriate. (Remember, while you have your engineer hat on, to take account of this when setting levels.) Always use a pop shield, and I'd suggest trying to work slightly off‑axis, as talking to a point just to the right or left of the mic will prevent bursts of air and drops of saliva ruining your recording. I'd also recommend wearing headphones over one ear only, as this allows you to judge volume and listen for clipping and plosives on the recording, while also hearing your natural voice, which makes it easier to focus on that message we talked about. Simone demonstrates this technique in the picture on the next page. Hhe's working slightly off‑axis and has backed off an inch or two to deliver with more energy.Typically, you'd record with your mouth approximately the distance between your thumb and little finger from the mic, as pictured here.
The advice we present here is tried, tested, and true. Peter Dickson is the foremost leading professional voice actor in the UK known for voicing the X-Factor, Britain’s Got Talent, Live at the Apollo, The London 2012 Olympic Games and countless brand commercials. In a stellar  career spanning 40 years, he has worked on over 120 TV shows and series, many of them award winning, been a promo voice on 60 TV and Radio channels around the world, been a featured voice actor on 30 AAA game titles, and voiced in excess of 30,000 radio and TV commercials!

Some clients are not experienced in voice over. So another way you can help them is to advice then and help them really understand all that goes into a voice over recording to get it to the final polished result. Of course you need to take this into account when you charge for your time and again whether this is a one off project or has potential to be a long term client.
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.
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.