The decision to transcribe or to hire a transcriber depends on a few things :
- How quickly you need it
 - How much money you have to spend
 - Your available time
 
Transcribing an audio can take a whole day depending on how long the audio is , the amount of speakers and the language and accent of the speakers. 
If  you choose to transcribe audio on your own here are a few tips. 
- Select a quiet area
 - Get good quality headsets
 - Choose a time of the day when and dedicate your time to it .
 - Do not transcribe and watch tv, attend to children , listen to music or any other things that would distract you .
 - Listen to the audio first to get a feel of the accent and language of the speaker then start transcribing after.
 - After transcribing check for spelling errors then proof read again .
 - Try this free online to help you to type faster http://transcribe.wreally.com/
 
If you then decide that you want to hire someone to do it for you can try these options