Nakasendo trail route help

Want to walk to portion between nagiso and Magome at the end of November. We are staying the night before in Nakatsugawa and the night of in Kiso-Fukishima. It's part of a larger road trip so we will have a car. Am I best off leaving the car at Nakatsugawa station, taking the train up to Nagiso and walking to Magome and taking a bus back-or all the way to Nakatsugawa? Or is there a better way to do this? Looks like sunrise is just before 7 and sunset just before 5. I don't want to be on the trail at night. But we want some time to have lunch in Tsumago and enjoy the post towns

by RainyDayRabbitHoles