Itinérant and jr pass

Morning,
I m going to travel from 19 déc to 1 January , we are2, we will arrive at Kyoto 2days then Osaka and nara (2days), then Hiroshima (1 day), Nagano 1day, nikko 1day and Tokyo 4 days . Do you think that it was a nice idea to take a jrpass 14day s? I saw that it was mandatory to reserve a dear before .. how can we reserve a seat for numero us itinérant very difficult in advance. Moreover could you explain if it’s possible to eceive the jrpass ticket in france , I imagine that it will be the best to active the ticket at the airport of Kyoto to go to the Kyoto hôtel with the jrpass too ? Thanks so much for all this questions KR