First, on the ground, you trim everthing to neutral positions, adjust the endpoints so they don't strain the control surfaces, hinges, or the servos, and set your dual rates to the recommended throws. In the air, you just trim it out at a reasonable cruising speed. A properly designed/built plane will not have any throttle to aileron or rudder coupling, but some may have throttle to elevator coupling (e.g. climb more at full throttle). This means the elevator is the only trim that is likely to vary with speed, but with a Pulse XT, I doubt you'd get much of that (some trainers like to climb more at full throttle).