If you press takeoff trim and green light lights up immediately and stick not moving t/o trim was already set. If pressing t/o trim and it takes a while for the light to light up and stick moving t/o trim was not set. Make it a habit before lining up on runway to press t/o trim check half flaps and arm seat.
And i forgot, dont worry about gun-pac until fencing in. Master arm on when approaching target area, happy flying!