Ms

Hi, I would like to get some advice if I should get JR Pass. My itinerary is:

4th: Reach Kansai International Airport > Osaka

5th: Osaka town + Kyoto

6th: Nara

7th: Universal Studio Japan

8th: Osaka Town to Takayama

9th: Shirakawago Light Up Festival

10th: Depart from Takayama to Nozawa Onsen Snow Resort

11th & 12th : Ski activity

12th- 14th: Fuji mountain (and places near Fuji mountain)

14th: Depart from Fuji to Tokyo

15th- 18th: Tokyo, flight from Tokyo Haneda Airport.

Do I need to get the 14 days JR Pass? And may I know more details on how to reserve the seats? Thank you so much :)