Probably need more details as to which version, engine series age etc.
Later versions more of a pain with DPF etc. Basically if you are taking the whole unit off then you have the flow and return oil pipes and washers etc. to remove, then inlet and outlet pipes plus bottom half of exhaust and vacuum pipe to turbo actuator , after that the three nuts/bolts holding it to manifold from memory.
The only one I did recently was on a 1.6 Doblo which was fairly easy to get to and I just changed the cartridge in situ leaving the turbo cast iron body still on the manifold.