Have just fitted Nissan ones.
Front remove Philips self tapping screw and the two plastic push clips each side. Use new screwed push clips supplied and re use Philips screw. Took 15mins to fit both.
Rear (YOU DO NOT NEED TO REMOVE WHEEL) remove 10mm hex head self tapping screw. Drill with 3mm Dia into the two dimples already in the plastic bumper. Put the two spring lock washers over drilled holes. Now I used a cycle multi tool with a 90 deg Philips head there was enough clearance between tyre and Philips screw head. Took 20 mins to fit both.