Hire an audio editor or do it yourself?

[BradShoemaker]

$20 is on the cheap side. Most people I know who edit audio for a living are up there in cost, but they will also deliver a product that sounds great (well great relative to the audio quality they received to begin with). They will edit and master the sound, but it is upward $75+ per hour of work.

[Ron Redwalker Knight]

Whoa.. that's pricey. I know someone whose rate is just a buck per minute. No hourly pay. Everything is edited and mastered.