Sometimes it is easy to see as the parking lots will be full and there are plenty of Pheasant hunter signs stating that it is the spot.
Other times, it is off of the road that it lists or much farther down than you would think. there was one up north (no longer stocked because of the landowner across the street) that was off of a dirt road off of the road that F&G lists. An officer checking out our grouse helped us find it.
Driving around for 10 minutes in the general area will help you find it and google earth can further limit your searching for some of the spots that are fields.