No special gear at all although the crank pulley is at 300nm so you will need a high torque impact gun if removing crank pulley.
I always use good axle stands and leave a trolley jack in situ as well for additional safety.
You remove the front offside wheel, peel back the inner arch liner once the retaining bolts have been removed and you will see the crank pulley.
Volvo quote an hour to do a cambelt change and that is entirely possible.
I've changed the belt on both my XC70 D5 and my XC90 D5 but both times the waterpump was left untouched as it was perfect. The access to the pump from this stage is pretty decent.
Contrary to popular belief, the belt can be changed with the crank pulley in situ but obviously it is an easier job if removed.
See here for Cheshired5 video
View of Waterpump change