Probaly 2-300 for the hitch, brake control probably 1-200 and 2hours to put in.150 bucks... ballpark and considering it is a toyota might be a little more. Bolting on a hitch and with the plug and play brake controls these days, its pretty easy to do yourself if you have a few tools and a little patience. Dpends what you are pulling to, under 3000 pounds you dont need brakes, might be 3500. I forget exactly.
I read your hole post now. Just lights, you just need a wire harness that are usually plug and play, last one I bought was about 80 bucks I think for a 98 cherokee.