Jeremy, replacing the light fixture is NOT rocket science if you are relatively handy and can read instructions. TURN OFF THE POWER. Slowly disassemble the existing hanging light, while you study the structure. If you do not want a hanging light, just remove what is there back to the ceiling box. Disconnect the existing wires (black, white, and ground).
Get your new fixture and install the necessary cross piece (if one is not there already). Twist new wires from fixture to color matched wires in the ceiling box. Install fixture. Be prepared to sweat and grunt and maybe cuss. Screw in light.
Activate switch or dimmer to make sure it works. Call wife and say "TAH DAH."