Position a stepladder or extension ladder under the fascia. Look for the nail heads on the top edge of the fascia. Although the nail heads should be protruding slightly from the aluminum, some installers drive the nails flush. Flush nail heads are usually roof nails with wide heads.
Place a thick piece of cardboard 1 inch below the head of the nail. The cardboard absorbs the pressure from the pry tool and helps prevent damage to the aluminum fascia.
Slide the small pry bar under the head of the trim nail if your fascia has the correct protruding nails. The neck of the pry bar should be against the cardboard. Pry the nail out of the fascia with the pry bar.
Hold the cardboard as close to the head as possible if your fascia has roofing nails flush to the fascia surface. Slip a rigid putty knife under the nail head, with the back of the putty knife blade against the cardboard. Twist the putty knife blade left to right to wiggle the roofing nail head up slightly.
Grab the roofing nail head with a pair of pliers and pull it straight out of the fascia.