celester,
Relax dude. The sim briefing pack is fairly basic. It lets you get a general idea of the profiles and the standard calls to be used in the exercise. You get a full briefing beforehand with the TRE, which lasts up to 90 mins. It's very comprehensive, and talks through the profiles in detail, with some handy tips as to how to manage each stage and the flying characteristics of the a/c. The briefing pack doesn't cover everything you need to know, but the brief does.
In the sim, you will be shown the location and operation of all relevant switches and equipment. It is a very basic exercise, and therefore only uses a very limited amount of the a/c systems. It's simple enough to operate as required.
I would suggest if you are still awaiting the assessment phase, spend your time concentrating on that. I understand far more fail to make the grade on day 1, than fail in the sim.