Right on left or left on right, doesn't matter really, 'cos on either you are in the correct position to see. As Ovr says, it's getting used to it that matters, on main roads etc it's easy, it's when you stray onto country lanes that have no lines on when it gets difficult. Did this in France a few years back, naturally strayed onto the wrong side (left), until something came headin' my way, soon realised !!
I prefer steering with my right and shifting with my left, but that'll probably change when I make it over there...