Have that very same torque wrench mate - will tickle your nuts off no worries
A few tips:
1. Don't be tempted to use your new copper slip on the wheel nuts when you put your wheels back on - they are supposed to be dry tightened to the recommended torque setting.
2. Torque setting for the S3 is 120nm, but double check your manual for the correct torque setting for the Q5.
3. Remember to undo/release the torque setting on the wrench when you're finished and put it back in the box.
4. Wheel chocks a good purchase as well mate - cheap as chips, but added peace of mind. You've got all the 'safety first' bases covered now pal. Probably obvious but if you're lifting both wheels on one side, then one chock behind the rear wheel and one chock in front of the front wheel on the other side. If lifting both wheels on the front, or both on the rear, then both chocks on the tyres at the opposite end of the car. Like I said pretty obvious.
4. When you're letting the car down off the trolley jack, make sure the car is unlocked! I set the alarm's motion sensor off on mine the other week. Made me jump out of my skin just as I was trying to softly softly lower the car, lol. Felt like a right plum