Fairly easy, I've done few few wheels, never disconnected battery either, but if you're concerned then disconnect a leg on battery, at rear are 2 torx bolts, have to turn wheel slightly of centre to get behind easier so not in way of the stalks, then undo 2 bolts & then pull it slowly forward, there will be a cable connected to the slip ring, unclip this & possibly a ground wire & then airbag of, undo the wheel with a large spline socket, make sure you do not & its important do not move the slip ring thats behind the wheel, if have to put tiny bit of tape on the ring until new wheel in place then remove, make sure when doing the wheels are dead straight & centre, then do reverse, the spline bolt needs a good tighten when new one on.
But fairly easy overall.