You will need to remove the inlet manifold in order to get to the coilpacks.
There are from memory 7 13mm bolts on the inlet manifold, including one right down the back on the drivers side. Then once you have this off (you can just tilt it upwards and use a hammer or piece of wood to hold it far enough up) you can undo the 10mm bolts that hold the coilpacks in place, which will then facilitate the removal of the plugs.
Just take care when removing the inlet manifold as the gasket may tear. If it doesnt, you should be fine to re-use it.