IUI/Fertility help

These may be dumb questions, but.. 
1. How does IUI work? 
2. What is the difference in IUI and IVF 
3. How much does it cost? The entire process of getting pregnant through IUI.. what is the total cost I would have to pay to go through this process? 
I know I could google these questions, but I don't want articles, etc. I want answers from "real people" with real fertility problems and real experiences with IUI. And hopefully real success stories. :)