It is really easy to do, you just need to make sure you get the plugs nice and tight and don't mix them up. I assume you are buying these:
What color car do you have and what color tails are you going to buy? I have pics of pretty much every color on every color Maxima when we did the first test fitting. To help give you an idea of what will look best. Not sure where you are getting them but get them from
http://www.ezkoncepts.com he helped to get them made and i worked on the initial design of them.
As for the install, here's something I did awhile back: