If you have a Pioneer or Premier CD/MP3/Radio in your car and you don't have an auxiliary input already, it's really not too difficult to add it, provided you have a compatible head unit. Models starting with a "P" after the dash such as the Pioneer DEH-P2900 are compatible. The aux input connects through the blue IP-Bus connector on the back of the unit. Pioneer sells an adapter that comes in the form of a little metal converter box but you can get just a cable adapter for much cheaper. I've done this in 2 cars now for about $10 each total and it has worked perfectly each time.

My 1996 civic had an accident prior to me buying it and because of that, the driver's side airbag had been used. I initially was only going to replace the airbag but after looking around on ebay it appeared that I could also get a new steering wheel with it for almost nothing. I spent $55 shipped and had an almost new airbag and steering wheel to install. I believe this guide will apply to all models of 1996-1999 honda civics.