Oil change is straight forward enough, getting the oil filter out can be a pain if you don't have the cup that fits over the filter as it's in an awkward position. If you've got the bonnet up, it's tucked away to the left hand side of the downpipe from the turbo, but you can only access it from underneath the car. It'll be worthwhile getting a new sump plug & washer too. I think it's 5.5 litres for the engine.
The gearbox oil is also fairly easy again, but you need to take out the battery to get to the fill point on the gearbox. Battery out is 13mm bolt to remove the retainer plate(and strap if you have one) to the left of the battery, after removing the pos/neg. You can then take out the battery and battery plastic tray. This should then expose 4 x 10mm bolts on the tray, 2 at the front, 2 at the back. Take this out which should drop the airbox bracket at the front of the tray and the fuse/relay holder at the back of the tray. There are then 4 x 13mm bolts holding tray to the inner wing, take these out, then the whole tray should come out exposing the gearbox. Easy from there to do. I think the gearbox is around 2 litres.