I've driven a righthand drive (UK registered) car in Sweden and lefthand drive (german registered) cars in the UK with no transition problems whatsoever. It's all in the mind.........

We've all probably heard the story (urban myth?) about the americans who drove all the way down the M4 from London to the west country in 2nd. gear because, back in the US, they'd only ever driven automatics and had never been confronted with manual gear changes..............They couldn't understand why the car used so much petrol on the trip!