What it's like to drive in Japan

I'm pretty used to driving on the left side of the road, having driven in Rarotonga, New Zealand, and Australia for several months. But I would be nervous to drive in Japan, because the roads are narrow and I am nervous I wouldn't be able to read the signs. But this video makes me think I should rent a car the next time I go there.
This video tells you about international driving permits, speed limits, rest stops, car rental, tolls, and other tips.
Video: YouTube