Minimalist Running Shoes

I bought some, several weeks ago, but I have been really sick with a chest cold, so today is the first time I have them out of the box. I was going to wear them to the gym this morning, but I think maybe a few days of wearing them for a few hours each day, out in the world, may be called for. I can feel that the are taxing different foot muscles than more supportive shoes would, and I don't want to overdo it.