You can do it without a lift- 458 or 488. Place a piece of carpet underneath to prevent scratching the bottom of the fins.
I sat on my butt and layed the diffuser across my legs and slid under the rear of the car with it across my legs. Then bent my knees to put it in position. If there was a second person helping it would have been easier, but not by much. Maybe took 10 minutes to get it bolted in place. Sent from my iPhone using FerrariChat.com mobile app