With regards to transport to Narita Airport

Hello,

I am staying near Shindaita Station and will be going to Narita Airport for my international flight scheduled at 1145 noon on Christmas Day (25th December). As it is my first time going to Narita Airport from Tokyo myself, I am rather lost. Upon researching, there seems to quite a few options but I would like some advice on which is the safest way to get there without hiccups. Do advise on my estimated departure time as well, if possible.

Thank you so much. Have a blessed day.

The easiest would be to go to Shibuya, Shinagawa, or Tokyo Stn and get the Narita Express. You can get there by the N'Ex in just under an hour. You should be at Narita at least a couple hours before your flight. It's 3000 yen.
http://www.jreast.co.jp/e/nex/

The cheapest way would be to go to Tokyo Stn and use the 1000 yen bus.
http://accessnarita.jp/en/home/

Another choice, especially if you have a lot of heavy bags, is the orange limousine bus. It's the most expensive at 3100 yen, but it can be convenient, particularly if you are close to one of the big tourist hotels it stops at.
http://www.limousinebus.co.jp/en/

One other option is the Keisei - it's quick, but you'd have to go across the city to Ueno.
http://www.keisei.co.jp/keisei/tetudou/skyliner/us/fares/index.html

Shin-Daita sta - Shibuya sta(Keio Inokashira line) - Shibuya Excel Hotel Tokyu(5 min walk) - Narita airport(Limousine bus).

Shin-Daita sta - Shibuya sta(Keio Inokashira line) - Narita airport(Narita Express).