It should be easy. Most after market stereos are all similar. Since circuit city already did all the wiring it should be easy. Most likely all you need to do is pop out the cheap stereo and see if the existing wire harness matches the wire harness on your new stereo. If they connect, which they...
screw honda get a yamaha or kawasaki. Honda sucks when it comes to dirtbikes, trust me. my brother has owned all 3 of these types and honda comes in last when it comes to speed and durability.