Never have learned from watching video; the concept feels alien to me. Far rather read written work, or go through a proper tutorial. The various wikis have been great.This explains it. Sitting down for 5-10 hours watching HOI3 vids makes you understand the game reasonably well (besides you can automate many processes), while Vicky 2 is just a monster.
Everyone learns in different ways.
Edit: Sorry for double post.