Had a quick poll at work this afternoon, 10 people, 8 men 2 women. Only 4 felt confident that they knew how to change a battery safely. One of those 4 thought it didn't matter which terminal you take off or on first. 4 of the 10 thought that once the negative terminal was disconnected if then while disconnecting the positive the spanner touches the car you will get a shock. 6 thought wearing rubber gloves would be a good idea. 1 would stand on a box if one were available. This should be a basic task that everyone can do, in reality it seems the majority would rather leave it to a professional.