the turbo is much easier if you take it all off in one piece with the exhaust manifold, with out taking both out it would be very difficult to get to the last two bolts holding it in the manifold housing.
and also i used 3 stainless bolts the same size and lenth, they were not torque heads though just round flat screw driver jobbies.
i found it easier though getting the bottom turbo hose off from underneath and also the bottom oil pipe,
there are two torque head bolts underneath for the oild return. just obviously needed to take the under tray off and also the top is s single 17m
and ye in the driveway on one axel stand to save time jacking it up and down,