You may remember this navy suit with white stripes, recently acquired in the infamous $30 haul of 2009:
Pressed into what I call a "hard" three button stance, that is, with the lapel "rolled" to the top button. Personally, I prefer what is known as "3/2 roll", that is, a three button jacket rolled to the middle button, or a two button stance. I suspect this suit actually was made this way. Here's why.
Of course, any tailor or dry cleaner worth his chemicals will know how to do this, too. Once, I brought a J.Press navy blazer to the Lee's for cleaning. I said to Mrs. Lee something like "I know it's three button, but when you press it...", to which she interrupted something like " I know, like a two button." She sounded a pinch insulted that I should even mention it. That was the day I really knew the Lee's were running a serious shop.
It was also the day I decided I ought to know how to do this myself.
Give it a try. It's only pressing. If you mess it up, you can always bring it in and have it straightened out.