The oil change is straighforward enough, I just reverse mine onto a pair of ramps and there is enough space to do what you need to do. The drain plug is easily accessible. To refill, just put the cartridge in a standard gun, and if you find there isn't enough space to insert the nozzle vertically, just bend the plastic nozzle through 90 degrees. As said, the oil is very thin, and it goes in easily. Whip out the nozzle and reinsert the drain plug sharpish and job done.
Changing the filter is trickier, but with a £7 tool off ebay and a socket set is again perfectly doable with the car on ramps or axle stands. Access is a pain, but not too bad once you've worked out where the filter is!
It's well worth doing yourself to save the £70+ labour charge, and at least you know its been done properly!
