While I agree the forum has help solve a few problems I have had & I recently looked at doing the same thing Repacing the Rotors is not that hard on a VY but after watching my mate who runs his own Mobile Brake business there is far more to it than meets the eye.
Replacing the Rotors was fairly easy but I then watched as he repeatedly removed each rotor and calibrated them on the bearing to fine the best location to run true so that their was no vibration when braking and this was done with a special tool attached to the strut.
After watching him I would have to say yes I could have done it myself but without the correct calibration tools I would suggest a pro do it.
Also if your thinking off replacing the Calipers see the thread attached.
PBR Big Brake upgrade