What is the most efficient way to travel to Niushoushan from Nanjing city? Is there a dedicated bus?

I have just visited Nuishoushan and I am not able to book a taxi/cab from the hotel as most taxi will not travel to this location. The easiest way is by Metro and bus. You can take S1 to Hehai University West Focheng Road Station and ask the Metro staff which exit is near to the bus stop that goes to Nuishoushan. Once you have exit the Metro station, there is a bus stop directly in front of the Station and you can take bus G70 or 754 to Nuishoushan which is the last stop. There will be some taxi/cabs outside the Metro which can take you to Nuishoushan.

After visiting the place, if you are lucky, you can get a taxi/cab back to Nanjing city alternatively,
you can take the bus back to the Metro and back to the city. (Bus stop is on the opposite side).

Thanks for this. Do you think this is possible for someone who speaks no Chinese at all?

To be honest, I'm not sure whether you can handle it. But it doesn't hurt to have a try.