The manifold comes off with the head dude. I speak from experience - removing the exhaust manifold with the head on is not a job you want to do.
Undo the three connecting bolts that bolt the turbo to the manifold (try not to round them - lots of WD40 first as they will be tight - they are expensive to replace) and take the manifold off with the head.
Also - don't lose the washers for the mani-turbo bolts. They will most likely be sat in the manifold. Keep them with the bolts as they are even more expensive that the bolts themselves.