Okay, this may sound silly, but I am not really sure what a day-of coordinator does. I keep reading about how it's one of the best investments you can make for your wedding and I'm beginning to feel like I might need one and I'm not even sure why.

Other questions:
-What do you hand over to them and how do you do it before the wedding day?
-What's the process for working with one?
TIA so much!