Every year I go to Europe from Britain and drive on the opposite side, it's a piece of cake. But it helps if you have a partner who keeps saying left hand side, at each junction. And at roundabouts just stop instead of gliding thru, always turn left.train your partner to say it out loud. Don't even think about manual shift. The main issue will be narrow roads ,when it's almost single track there's a temptation to drift onto the right, AVOID small country lanes