How do you change a EGR valve on a 1996 Ford Taurus and also are the two forward O2 sensors the ones on each manifold?

The EGR valve is the disc looking device on the back of the intake manifold. There are 3 bolts holding the valve in place, two 10mm size bolts on either side and one larger bolt on the input line. As for the O2 sensors I am not certain of their location.