I need help and some confidence

Hello all, Im new to this board and I have a problem. I have a 92 Lx Civic 1.5 Automatic. Big problem huh? Just jokin. I love the car, I just put the motor in with 30,000 miles on it. I have an OBX carbon fiber CAI, TC throttle body, a custom mandrel bent exaust and a 65 shot Zex nitrous kit. My main problem is flat out, I don't know how to drive it. If im racing someone is it safe to hit the nitrous in all four gears? I'm wondering this because if I slam the gas in first with the switch on, it'll automatically kick in at 4 grand. In all four gears. Is there any way to regulate the nitrous to a specifiic gear, or should I just use the kit like a turbo, all gears 4 grand and up. Im kinda scared to hit it because I just had 300 dollars worth of head work done because I had a heavy foot. I've got the burt valves to prove it. There in my room. Stupid 6.5 grand revlimiter. Is there anyway to remove it? Im planning on going all out on an SCI ignition too will that help?