I have done several large jobs for several different churches, with minimal problems. That being said you can count on everything everybody said to be true, and then some. Just bid the job per the drawing, include a detailed scope of work, what you will and wont do, and stick to it. Price the job like you would any other including your profit margin, and remember if you do not get it you probably do not want it. As far as estimating, the going rate in my part of the world is $35.00 per drop, this is each receptacle, switch, and fixture, add to this the cost of the service,($2.00 per amp here) then add your usual percentage for headroom in case things get ugly. Put it all on paper and hope for the best.
No pun intended, but how in the Lord's name can a service be estimated a $XX.00 per amp?
