What you really wanting to know exactly mate?
Turbo-Biggest prob is nut deciding to sieze onto the stud. Hefty strong bar and time will eventually remove the nut.
Intercooler-No real problem, just make sure you tighten all the jubilee clips, so there are no leaks.
Injectors-Caps can be broken when removing if not careful and make sure you fit the new ones appropriately.
Uppipe-Simple enough....2 extra bolts and nuts to come off after the turbo comes off.
Fuel Pump-Remove old one......fit new one. Easy.
One word of caution, use new original Subaru gaskets for turbo, up and downpipes, otherwise you may end up removing them all again, when the cheap ones don't seal up properly.