Whatever you do - don't replay the lesson in the car on the way home, as I used to. It could be very bad for your health, though I got away with it. Puuling back on the steering wheel doesn't do much, anyway.
Learning for me was like climbing one of those big hills where when you think you've got to the top, there's another hill in front. It took me two and a half years, what with much work and the weather and schools going broke etc, but was well worth the wait.
B