Secrets of nitrous, I'm a nitrous user I'll be happy to answer any question you have. First thing you should do Is get a bootle pressure guage if you don't have one yet

Safety is important. So your most impotant two mods are 1)High Octane Gas 2)The right Spark plugs. Using the wrong plugs is very bad just like a turbo engine.
3) a Fuel Pressure Safety Switch. Makes things nice and safe. It will cut nitrous if fuel pressure goes down for any reason, and prevents you from going lean.
Only spray in 3 gear and up at Wide Open Throttle. Always start with small shots. If you get an RPM window switch your system will become even safer and you can safely spray in all gears (1st & 2nd without one are bad because you might over rev the engine).
THE best supporting mod is to open up your exhaust. And if you want comfort & consistency a remote bottle opener and automated bottle heater are great things to get down the line.
Nitrous is safer than boost if you spray responsibly. Most people have the wrong idea from seeing F&F a few too many times. Nitrous is FI, your just sticking more Oxygen into each cylinder and fuel to compensate.