But I'm not interested in doing the entire job myself. While installing a sound system isn't exactly rocket science, it is more complex than painting one's house. That's one reason why you need to do your homework on the contractors you're considering. Please at least seriously think through all of the realities before you let your church go off the deep end in their eagerness to simply save some money. They may save a few dollars during the installation, but the toll that the process exacts from the church's volunteers may not be worth it in the long run.
People are more important than money.
Now, don't go around telling everyone that Curt said that no church should install their own sound system. I didn't say that. All I hope to offer here is a voice of reason in your eager pursuit to save a couple of bucks. If you're thinking about installing your own sound system, please determine now that you will sort through every possible issue. Develop a contingency plan for all of the things that are going to go differently than you plan, because they will.