Yes and if you are changing from a forward gear directly into reverse try releasing the clutch as the gearstick passes through neutral. It's called "double de-clutching" and before syncromesh gearboxes all gearchanges had to be made this way.
New Judge, I used to love the double declutch method, it sorted the men from the boys, the drivers from the drovers.
I have a new car and I still double declutch when changing down a gear on a hill, old habits die hard!!