[Icycharizard]

Hi there, the dealer notified me by video that my rear guibo disk is cracked and worn on my 2016 X1. Can anyone provide a guide/youtube or otherwise, or a break down of this type of job and its ease? I am a pretty experienced mechanic, but I want to know if it is worth me doing versus $1213 at the dealer. I can definitely tell it is going bad. I thought it was the transmission mount tho. It clunks when putting it into reverse most of the time.