This method requires you not being afraid to take a hacksaw to your inner fender lip. But it is really easy to do, and can be reversed if your careful. first pick 3 or 4 places on your fender that look like good support points for your skirt.
a hack saw or i used an air cutoff tool,
go slow and cut close to but not the visible fender lip.
then grab it with vicegrips and bend it down,gently!part of my fenderlip is plastic so i had to mount a bracket (homedepot truss strap)using self tapping metal screws
then take your metal/aluminum/plastic
and hold it up to the fender or tape it and reach around back with a marker, follow the fender opening. then depending on your materal cut it into the round shape, leaving room outside the line to curve/bend the material to close to the shape of your car body. and to clear your tire.
fit it into the opening and trim it as needed,drill holes into the tabs you bent down,hold the sheet up against the opening and mark your sheet and drill holes in it. then mount it with small srews,washers,and nuts.some photos of the finished product,not perfect,but im impatient and did it in around 2 1/2 hours, you can make yours look perfect if you take your time!
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, more mods and some aba when time and wind converage.