If you've got a bunch of spare time and want to learn some new things, you could learn everything you need to install this just by reading online. Nissan forums will certainly have information and maybe even guides for installing aftermarket stereos. Combine that with Tony's FAQ and info on this BBS to learn the specifics of the empeg.

The hardest thing, in my opinion, would be running power cables from the battery. Check The 12 Volt car audio forum for info about that, and more.

No need to be fancy. Stock speakers and a low-end amplifier are all you need for a basic install. If that works out, you could always upgrade later. Good luck.