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Nitrous is regarded as dangerous because people half-ass it all the time. It's not actually dangerous when properly done.
Nitrous changes the optimal AFR and spark timing of the motor, much as turbos do. Don't bump the injector pressure, some injectors can't handle that. Optimal spark timing with nitrous is lower than without, all else equal. This is why simply injecting nitrous and fuel pops some motors. Optimal AFR is simply a thermal control mechanism, it varies motor to motor, use to use.
Some motors "take" nitrous better because they came from the factory with a more conservative mapping with more room between MBT and the knock threashold.
The absolute best, most reliable way to do this is to size some huge injectors, setup port injection, let an EMS handle the nitrous fuel and spark, then have a competent tuner setup the whole thing. The least reliable way would be to simply inject enough nitrous to blow the motor on a hot day, then hope for the best.
I prefer a turbo as well. It's always there, no screwing around with a bottle that can literally blow up in an accident, and it's more usable for longer periods of time.
To give you an idea of the chemistry of this, as oxygen concentration goes up, so does the "explosiveness" (kinetics) of the combustion. Nitrous increases this oxygen concentration. An analogy can be a match. Burn it in air (~20% O2 by partial pressure, IIRC) and it will burn slowly and go out. Burn it in a cloud of 100% O2 and it will almost explode.
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