Hey Clark, I imagine just about any dive shop in the Chicago area is going to offer a drysuit class...and I recommend that you take one. There are a few concerns when diving with a drysuit that you need to be educated on. I dove with one the other day and had a difficult time with my buoyancy. Some divers get turned upside down due to the air stuck around their legs. I also used talcum powder around the neck and wrist seals to get the suit on easier. And make sure you use the restroom before getting suited up because you don`t want to pee in a dry suit (unless you have a suit with a pee hole, yes they do make these). And you may need ankle weights. Anyways, that`s my two sense.