gaining access to the pipe joints is the tricky bit, I found it best to remove the front headlight, which does involve undoing the front bumper bolts so the bumper can be dropped a little to access the retaining bolts of the headlight, there is no need to remove the whole thing, it just needs to drop a couple of inches. The whole process adds some 15mins but makes getting access to the unions so mush easier.
De-pressurise the system by removing the pump relay, put the key onto MAR and change gear until it stops working.
The spanner sizes are a bit weird as well, IIRC you will need a 19mm for larger union and a 11mm flare spanner for the smaller one, space is limited as they are set close together so the tools need to be fairly slim.
HTH and good luck.