Can anyone tell me what is the fastest & easiest way of getting to shigakogen ski resort from Narita airport?

Thank you for your timely response. Also, I would like to know if it worth it to get a JR Rail Pass?
My itinerary:
1)Day 1: Narita Airport - Tokyo - Nagano- Shiga kogen
2) Day 2 - 5: In shiga kogen resort
3) Day 6-7: Shiga kogen - Disneysea.

Also, I would like to know if it worth it to get a JR Rail Pass?

Certainly not the nationwide pass.

Thank you very much again. So a single trip ticket is definitely more worth it than a 7-days JR rail pass trip right?.
I have been getting different messages.
The ski resort should have opened by late Nov right?
Also, how to get to Disney sea from Shiga kogen ski resort?

Yes. Single tickets from Narita to Nagano and back to Tokyo cost around 17,000 yen, which compares to 28,300 yen for a 7-day Japan Rail Pass.

The ski resort should have opened by late Nov right?

Usually yes. But I think it cannot be guaranteed.

Also, how to get to Disney sea from Shiga kogen ski resort?