Holy crap some of you guys got HOSED!
A nitrous install is not complicated. I bought my kit and installed it myself with 100% basic hand tools and a pair of wire strippers. That's it.
If the kit provides good instructions, as mine did, it makes wiring VERY simple. I am NOT good at electronics. I can't tell you how a relay works, etc. yet I set my kit up (which includes a relay, lol) by following the color coded wires to the color coded diagram. Even if it's not color coded, you will figure it out easily.
The most "difficult" part of the install was tightening the bottle brackets down. That took one extra person to literally sit there and hold a wrench while I tightened from underneath the car.
I am using the Harris Speed Works 2v plate kit. It sells for $499 and is awesome. SUPER clean install with the plate and their new solenoid mounting brackets. I highly recommend it.
And for what it's worth, and I don't necessarily recommend it... but I'm running a modified stock tune VIA Diablosport Predator. I pulled 10% timing and added 15% fuel. So far on the 75 shot so good. It hits well.
IF you do this, PLEASE do yourself a favor and have the car put on a dyno and get the A/F ratio checked. I haven't done this because I literally spray for 1-2 gears max just messing around, but before I put the 100 shot in or make a track pass I am going to verify the A/F ratio. You CAN and people do run the stock tune with no issues so long as the A/F ratio is in check. You CAN run a 100 shot on stock timing... it is "safer" to pull 2-4* but if you aren't spraying all the time, it's do-able.
All a nitrous tune is, is the adjustment of timing and fuel curves in a nutshell.