Hey man, i say definitely black out those headlights cuz they make a whole lotta difference when your done with them. I did that whole projector thing and let me tell u, when it was all done, i got head turning since i was the first to do it over here in MA.
Here is a thread i wrote up awhile back on how to do it.
http://forums.altimas.org/zero...-wait
I highly suggest u do all the aiming first and take your time with the opening of the headlight. I did this on a sedan but the coupe's shouldnt be tooo too different.
Take your time cutting the projectors and how u set it in.
But good luck on your adventure on this project, it'll be worth the time and effort. TAKE YOUR TIME, cant say that enough.