Getting to the Isle of Man isn’t difficult, but it’s not trivial either. There are daily flights from London, Manchester, and Belfast into the airport (IOM) on the south-west coast near Castletown and there are also daily ferries from Liverpool and Dublin to the Ferry Dock on the West coast of the island near the capital city of Douglas.
Once there, you should hire a car from one of the local independant rental agencies – and yes, they drive on the left side of the road. There are taxis, but they really stick mainly to the capital city of Douglas an the island is quite rural.