interior neon isn't that hard at all, and to do the underbody, give plenty of time. Running and mounting the cables is the most time consuming part, and mounting the tubes is fairly easy. You must be sure to mount the tubes very good, as so not to have excess vibration of the tube against the body of the car, which can break em very easily. I guess finding the right spots to run and mount the cables to the car is the worst part, but all in all, not too dificult. I'v done many underbody kits, and it gets easier all the time. I would recomend Street Glow gold series, I'v had the best luck with them not breaking. Lite glow sucks, their tubes always seem to break very quickly no matter how they are mounted...Also, check your local laws with neon lighting, in many states its illegal to drive on the streets with them on...and what colors are legal..

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
My webpage: http://eclipsed4evr.home.comcast.net
-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)