This was a day before class at the Atlanta Sewing Expo. It cost $200 and is the best money I ever spent. I have a pants pattern that FITS and feels good.
The class requires that you use Cynthia's pants fitting book (it is sent to you beforehand with your Expo info) and a pants pattern of your choice for your homework. You work through the measuring, math and marking up the pattern and create a muslin to take to class for "tweaking". (I did 7 before I came up with one I wasn't embarassed to take to class) This is essential to the success of the class. You don't want to take class time to do basic sewing you can figure out on your own.
There were 15 ladies in the class and we each left with a muslin that fit. We each put on our muslin and Cynthia pinned and fitted as we all watched and asked questions. We saw her fit a large variety of "problems", including our own, and learned a great deal. We would make the changes she showed us, try the muslin back on and she would "tweak" them again.
This class is a must if you wish to sew well fitting pants for yourself.