As with screws, a little paraffin or beeswax will make driving certain nails, especially casing nails, much easier. If you are driving a cement-coated nail, always keep it going all the way once you start. Friction heats up the nail's coating and if you stop midway it cools down and tries to glue the nail in place.
When hooking up a trailer, instead of connecting the trailer’s safety chains directly to the hook in front of it on the vehicle, cross them. Put the chain from the right side of the tongue to the hook on the left side of the hitch. Likewise, put the other chain onto the hook on the right side of the hitch. That way, should the trailer come unhitched, the tongue and coupler will land on the crossed chains instead of skidding on the road.