Can I suggest not driving all over the continent. For long-distance trips, there is really no advantage above rail or cheap flights. I would also suggest not driving in large cities. Every large city in Europe has a few spots where people play "crash into the foreigner who didn't realise he has to yield at this deliberately badly designed junction and get his insurance to pay for a new car" - admittedly a hilarious game which I have played myself in younger years (never got a new car though), but probably not much fun if you're the foreigner...

If you want some great landscape photos, by all means rent a car for a day or two and bundle the 4x5 into it, and drive over a mountain pass in the Alps. It's great, and not to be missed.