Kep in mind that everything that you‘re tested on will be taught to you. You‘ll learn it, and practice it repeatedly before you‘re tested on it. Your Instructors do NOT want you to fail, so if there‘s any doubt in his/her mind that you‘re weak, they‘ll make every effort to correct the deficiencies. (by the way, this goes for everything, not just weapons)
One thing to keep in mind is that Military weapons are, by nature, a tool- and these particular tools are designed to be used in an agressive manner. Do NOT be afraid of the weapon, handle it gently, or slowly. Be aggresive, grip the dang thing hard, and make your movements strong and assured. When firing, hold on tight, and be aggressive. This is not to say that you can bang the weapon around, drop it, smash things with it, or generally beat it up- but it is designed to be used by big, strong, agressive folk. The drills are designed to be aggressive and forceful.
This weapon has only one purpose. Every time you are using it, act like you know, and accept that purpose, and you‘ll be fine.