You would definately want to gear down for heading downhill. Engine-braking is less likely to put you into a skid than hitting the brakes, as engine-braking in 2wd will slow the rear wheels, while brakes are proportioned more towards the front wheels. The unpaved road will probably be to your advantage, as there will be more natural "traction". The key is to make your downshifts as delicate as possible, otherwise you make break the wheels loose when you drop the clutch. As I said before, just try to plan and drive way ahead of where you are. Usually by the time you realise you're going too fast for conditions, its too late. I like the analogy of driving like you're trying to not spill coffee.