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I have been running nitrous for about a year in my 95 EX coupe- D16Z6 (89K). First I applaud u for posting and not just throwing on a kit and blowing your motor then posting asking us why u blew it. Below I have listed the steps I have taken with my nitrous along with my dyno numbers:

1. Read and do research before u buy and hook up anything. I have sat in Barnes and Noble bookstore for hours reading magazines and books. I would recommend a book called "Sport Compact Nitrous Injection" by Joe Pettitt, it can be ordered on amazon.com for $13.27, there are a few other good books out there just look in the car section. Also find all posts in the forced induction forums on here, honda-tech.com, and dserieshonda, people with your same car will tell u there experiences- good and bad with it. I researched for about 8 months before I even ordered my kit.
2. Start out small 35 shot then to 55, and if u have balls and a strong motor a 75 shot. I purchased a Nitrous Express Import Single Fogger Wet Kit. It sprays nitrous and fuel through the same nozzle and into the motor. I have never had a problem with the kit, great quality and customer service.
3. Purchase the Gen-x 2 upgrade kit it comes with a purge solenoid and tube, blow down tube(required if u race at a NHRA track), bottle heater, gauge and adapter. Good investment.
4. A few tips while spraying, DO NOT spray below 3000RPM u will have what is called nitrous backfire, with a wet kit spray u fuel into your intake manifold, at too low a rpm the velocity of air is not traveling fast enough to pull the fuel in too so it will puddle in your intake manifold and kaboom!!!!!!!! I backfired once at the track- black smoke everywhere, thought I broke something. Do not spray until redline I stop at 7000rpm on my Z6.
5. I would HIGHLY recommend buying a NX TPS switch, it only opens the solenoids at wide open throttle so u make sure you are not running lean. I also hooked up a MSD rpm acivated window switch so the solenoids will only open between 3000-7000rpm's. The MSD sends out a 12V- ground signal out in the certain rpm range. The tps requires a 12V+ and 12V- to operate so I hooked the output of the MSD to the ground of the TPS so even if I am at wide open throttle I cannot spray until the MSD box reads between 3000-7000rpm, this is a failsafe way to ensure safety for u and your motor.
6. Have your car dyno tuned to ensure your air/fuel ratio is within an acceptable range, I paid $55 for three pulls and tuning at my local shop.
7. Buy a air/fuel gauge even if it is the crappy autometer one like I have, it will tell u things u WILL want to know.
8. Buy colder spark plugs. I was running NGK ZFR6F-11 (1 step colder), they were fine for a 55 shot but melted when I went to a 75 shot. I now run NGK BKR7E (2 steps colder) they have held up fine.
9. Retard your timing like the nitrous manual says, u dont want to melt a piston (or melt spark plugs like I did) because of the high pressures, and temps. FMIDRC Racer threw a rod in his 1.5 minime block with a 55 dry Zex shot.
10. Be careful nitrous like boost is addictive u always want to turn it up a notch, but our stock motors or clutches were not meant from honda to make that much instant torque and horsepower, you will need to do some mods to reap the benefits.
11. Have a good open exhaust I run a Apexi N1 full catback, with a test pipe. It is also recommended to get a good header to let all those extra exhaust gases exit faster. I dont have a aftermarket header because I am going turbo soon and dont want to waste the money.
12. Change your fuel filter
13. Check my other posts in the forced induction forum, I have a few and gotten alot of great responses, just do a search. D-series.org helped me build my Z6.
14. I have and do still smoke mustangs and alot of other cars, people are so suprised how I pull away from them and then open my hood and they only see 1 cam gear.
15. Good luck please email me with any questions at sammydhoff@yahoo.com
Below are my dyno numbers with a 55 wet shot:
(I now run with a 75 shot but havent put it on the dyno yet)

Run #1 (Stock w/ bolt-ons) Max Power 117.8 Max Torque 99.6
Run #2 (NX 55 Wet Shot) Max Power 158.3 Max Torque 162.7

Below are my mods.

Z6 w/ stock internals
stock timing
NX 55 Wet shot
AEM short ram
pulleys
no A/C
apexi N1 catback
straight pipe

any more questions......just ask us. We'll get ya through it.

Oh......and don't forget an upgraded fuel pump. Forgive me if it was said before. I didn't bother looking and just went by what I remember reading in the above posts.