Is changing the rear disc and big job ? Couldn anyone give me a few intrustions ? Thanks

Slacken Hub & wheel nut with bike on ground (36mm & 48mm)

Abba or Axel stands,

Wheel off

Undo hub pinch bolt (17mm)

Rear caliper off

Hub nut off

Slide sprocket/chain off

Pull out axel from hub

Undo 4 m8 disc bolts

Fitting is reverse of removal

Thanks mate , all sorted just need to order disc and I'm
Away