Earlier in the day I was in contact with an online Japanese friend in Tokyo,
and it was with his help I managed to figure out to get to Asakusa from Shibuya with JR (not the metro since I used my JR Pass).
We emailed back and forth over our phones, and I am most grateful for his kindness and help this Friday.
THANK YOU Mr. Toshiya Kobayashi! ❀(◕‿-)❀