Same way I would go about it.
With nitrous, there really should no street tuning necessary. Since a wet nitrous system isn't something that will effect fueling globally, its safe to say, you can do a dyno tune with the reccomended ignition retard from the manufacturer, then adjust jetting and what not. Three runs should be enough to nail down a good A/F and make sure there is no knock.
It’s a hell of a lot easier to tune with the car in one place, and being able to look at your laptop or scan tool to make sure everything is ok.
Street tune is crucial in most applications, as well as a friend who can watch and log information for further tuning. Kind of sucks though, if you are too far off base, might not have time to react if you’re doing it yourself, then reviewing logs.
I would be content with good A/F ratios, no knock, and good looking plugs after the dyno pulls.
Please re-gap your spark plugs, and at least go one step colder.
<3
Nate