Hello,
you've 90 minutes to learn and understand the rules and tasks and during that period you have the chance to understand and try every subtask; imagine a basic flash-game.
So when you reach the "how to mark a local conflict" part of the session you will be provided with a few examples. If you're good: that's cool, you can continue. If you mess something: that's pretty uncool and you have to repeat (at least you should repeat) that part. But remember: time is clicking.
After the one and a half hour you'll have 3 minutes to try yourself and your fresh knowledge before the real deal; that's not too much, indeed.