Do hire a guide, and do hire Ryan at: http://coastalwisconsin.com/contact/
He's a sponsor, he's a hell of a nice guy, and he will get you on the birds.
Don't turn the cheek on my advice. Do this hunt with a professional, and learn a few things before trying this on your own. Be forthright with him, and tell him your intentions. He might be willing to share some insight? I wouldn't expect anyone to try and nab a particular area from a guy, because it is a big lake, but you will definitely learn a few things.
Don't be afraid to try something a little less dangerous than the big lake itself. There are safe alternatives that will get you divers. Did I mention he offers a diver hunt as well?