Typing on my computer so my ID might change.
>>262253
I was a classics student who learned Attic first and learned Koine through self-study. It's definitely worth it! It greatly expands your sense of perspective and can be a very devotional practice.
The Greek of the NT really ranges in terms of complexity. Revelation and Mark are the most simplistic, and a novice learner can reasonably expect to be able to read them in a few months. Hebrews and the letters of Paul are the most complex and will take longer.
>>262265
It's unambiguously "and the tongues of angels." It's a theological question, not one of translation.