Book before FG...much easier and you've got it all sorted...car, insurance etc and pick up/drop off at the airport. Best advice is leave gf to get the luggage (if any) and you dash through to hire car office. It hopefully beats the inevitable queue. Auto Reisen is about the best as their on line booking includes 'full' insurance cover including no excess CDW insurance.
Supplier of quality decals & logos in cut/full colour vinyl, personalised tea/coffee mugs, banners, digi photos on art canvas etc for the trackdayer/racer.