hardwired fan w/ lights controlled by switch
The question is whether you have the skill and experience to identify the correct wires, and how they'll attatch. You'll also need to disconnect the no longer utilized wires at the box where they draw power. It's a safer alternative than leaving them intact and using wire nuts to sort of "cap off" those wires.
If you're not sure how to do this, look for someone who does. It's a small job, and the small expense of having someone experienced do the work will save you worrying about this later.