There are different contexts to which this would apply. Hop in Duty Finder for Ifrit Extreme? You better know the fight. Join up for Chimera? Nobody cares, you can even die and go afk. If you create a Party Finder for a specific event, make sure everyone knows you're unprepared. It will save people time.

The original poster seems like one of those regular weak-links who want to be carried through any situation. No, you don't have to watch videos. But, no, you won't be allowed in most experienced groups.