I've said it before, I'll say it again - avoid upgrading anything through the builder that you can do yourself. We paid a couple hundred bucks to "upgrade" from the standard kitchen tap to this piece of cr@p Dorf Oasis spray mixer, and look at the just how much quality you get after a year of use, with all the braiding frayed, exposing the soft plastic hose inside.
To change it actually took a lot longer than I thought. Ideally you'll need a big wrench or two, a basin wrench, screwdrivers/hex drivers, spare towels, things to catch waste water in. Make sure you turn off the water from the internal taps located inside the kitchen cabinet first, disconnect all water lines to the tap and drain into containers.
After the old tap is removed, clean up the benchtop where it used to be,.
The final result... well, almost! This tap is retained in the benchtop a totally different way with a massive nut on a 35mm screw, and the plastic washer it came with was too big to fit under the sink, so at the moment it's held in only loosely. And of course, once I hooked up the new hot and cold water hoses, I found the hot hose had a crack/leak in it, so I need to get a replacement of that. Tomorrow, a bit of fine tuning with a bench grinder on the washer, and a trip to a hardware store for a hose, and hopefully it'll all work out well!
Also ordered a new TV from JB Hifi online yesterday, and already having second thoughts about the whole process - should've walked into one of the stores and bought it that way, because their online store is truly craptactular. Logging into my account doesn't reveal my order, there's no contact phone number to call, and they don't return emails. No wonder we're all shopping online overseas, if this is the best an aussie company can do.