slacken of the two outside ones then turn the inside one to slacken the bar, you will see the thread moving into the bar.
then take the 3 bolts out each side and then the 1 nut each side and it will come off, if its awkward you need to turn the middle nut on the bar. dont forget there are some bits of harness clipped to it. The torque values and procedure for putting it back on are contained within the workshop manual which is downloadabel
EDIT: like the PDF above