IRD?, in/out with or without gearbox??

Hi folks. Im trying to save money by changing cluth on my freelander TD4 sport, i am fairly handy around cars. My problem is, i own a freelander! And i seem to have come to a halt re the IRD unit. Question; does it need to be removed 1st and then the gearbox?, or will both need to be dropped(working from underneath) at same time?? If its coming out 1st, then can someone explain how u get the 2 upper bolts out, or rather, how u reach them!!! Some help on this would save my head exploding today. Thnx, Mick