Tell us about yourself!
Nitrogen is neither explosive nor toxic what are you talking about. It's the lack of oxygen that kills not a high amount of nitrogen. Just make sure that you are in a ventilated area with fresh air coming in and you should be good. Btw, nitrogen is inert so it can't possibly be explosive. A sealed tank full of nitrogen exposed to heat might explode because of pressure, but not the gas itself. It is still a bad idea to use nitrogen as a cooling agent since it would be too troublesome to contain/transport, and there are easier and cheaper substitutes, however not for the above-mentioned reasons IMO.