Hi.. top cars
As it would appear youve not been too familiar with the job itself
You dont need to jack up the car
The wheel bolt adjacent where the valve cutaway of the trim currently is..
CAN STAY IN PLACE
Undo the other 3 bolts..
The trim will then wriggle off ( it has a slotted hole.. so can be 'hung'on 1 bolt)
Once the trim is removed:
Reinstall the bolt nearest the airvalve on rim.. hand tighten.. to moderate torque
Hang the trim on this bolt..whilst slotting the air valve through the trim
Then install the other 3 bolts again.. moderate torque
Once youve got all your trims seated correctly
Roll car forward @6 feet-2 metres
Then fully torque all bolts
SEARCH on here is great :
https://www.fiatforum.com/500/337447-500-wheel-bolts-torque-values.html?337447=#post3356919
The tyre place really ought to be doing this for you..
Their paperwork should advise retorqueing at 100 miles anyway..
Charlie