1st. Like everyone is saying, get someone else to do it...installing a nitrous kit is pretty easy to do and if a "mechanic" is asking how to do it, you got issues.
2nd. Mounting the nozzles is pretty simple. The zex kit should come with a tapering bit to drill the hole. You can either A. mount the nozzles directly in the pipe, or B. mount them in a jam nut that will mount in the pipes.
Here was my setup...not the cleanest but it worked perfectly. The NMU is right below the (as your looking at it in the pic) left intake by the throttle body.
