Questions about catching up on the Arrowverse

Okay, so we're doing this. And I have some questions. I'm now up to Season 3 of Arrow, which is when other shows start appearing. I've found this exhaustive list, which is every episode of every series in chronological order, and while I do have a completionist streak, the idea of tackling the exhaustive list is, well, exhausting. I've watched the first two episodes of Flash S1 and Arrow S3, alternating them as the list suggests.

( Two questions: )

Any thoughts are welcome. :) Thanks!