Source: www.recordingreview.com check them out
For whatever reason, when people hear a home recording, they almost automatically say “I could do better than THAT!”. Of course, it turns out being WAY more difficult and most people give up and move on to something else. This doesn’t mean they don’t try a few times taking a few potential clients with them.
Some Bands Won’t Need Much Of An EngineerThe best bands will always sound the best. I’ve seen this time and time again. The best bands usually won’t have much trouble tracking themselves after reading two web tutorials. If the band already sounds good, just about any idiot can place a mic on a snare or a cabinet. The hardest stuff is already taken care of by the good bands. Most of these kinds of bands do need a guy who can mix as that is an art to itself. So with that said the value of an engineer isn’t what it used to be. End Excerpt from www.recordingreview.com 
This is true to a degree but another set of ears is always good. I have mixed down tracks for hours on end,then I take a break for a couple hours and come back to the same track and hear it in a completely different way. Engineering can make or break your song. A good engineer sometimes has to put his ego and his personal musical tastes aside when he is mixing down a unfamiliar musical track. Some of the best engineers are also producers and that is a whole different subject. And I will add that engineering or mixing down a track in a million dollar studio is a little different than in most home recording studio’s as I have done both.
