The AA training is a bitch to complete because you have to do everything in the set order he mentions and really control your speed otherwise he won't continue.
Frankly it's my perception that the TGP is useless for AA. What are you going to do? Randomly scan sections of sky in case something is there?
Without a radar it's all VR, so you see the plane, go to AA HUD mode, select conical scan, get lock inside range (guess it visually), and fire. That's all you need to take away from that training. That and how to select different gun funnel profiles.
Sometimes you need to press buttons for longer to get it to register with the instructor.