It's not difficult once you get in there.
Remove the three small bolts that hold the oem "outlet/muffler/adapter" onto the turbo.
Disconnect the turbo outlet pipe from the intercooler hose.
Remove the two small bolts holding the outlet pipe to the engine and remove it all.
Remove the oem adapter and hose from the outlet pipe.
Install the new turbo outlet adapter using the three small bolts...making sure its large o-ring is in place.
Reinstall the outlet pipe using its two small bolts while also connecting the new hose to the outlet adapter. Clamp does not need to be tightened yet...but can when you see all is connecting well.
Connect the intercooler hose to the outlet pipe and tighten everything if not done yet. If you do not have proper clamps in your kit...be sure to get high torque clamps.
Here's one vid I found...he doesn't show very much, but some of it may help you. FFWD to about 0:50.