amplifiers. amp

Would it be hard to hook up a subwoofer and amp to my ‘92 YJ? I’ve looked at a lot being privately sold but would I need to buy extra wiring and mounts for it?

I'm new here so I'll introduce myself first. (Sorry if this is all in the wrong place) My name is Wade and I'm on my 3rd Jeep. I now have an 04 Jeep Wrangler Sahara. I have it lifted to fit 35s (But have 33s so I can still drive it daily), Oversized TBI, Cold Air, and a chipset. I don't plan on...