watching a video can only get you so far, experiencing the mechanics of a fight and learning them first hand is what counts.
When learning, a healthy dose of situational awareness and adaptability will help too.

There are ins and outs that a video just wont show you, i watch videos of coil and ex primals so i can get a basic understanding before heading in, but those players that say "watch a video" and then expect you to be perfect first time, well those players are to be avoided.