Its gonna be a messy awkward job, But not difficult to do in the car.
Exhaust off and possible the rear engine mount,
Remove the green sensor that bolts into the sump, The probe is about 8 inches long and tangles up with the oil pickup strainer.
Your gonna need some long Ribe bits to get to the sump bolts at the gearbox end. You might get away with using torq but i wouldnt risk it if i was doing the sump in the car.
The sumps are sealed on at the factory with black silicone, About £15-20 from main dealer, Or about half the price from local motorfactors.
Think that kinda covers it, If ya get stuck giz a shout, Just changed a sump on mine last weekend.