It's not hard at all. I haven't put a new on on my Jeep but I took the factory one off a loooong time ago. Pick whichever 2" hitch you want for your TJ and it'll come with the instructions to do the job.
Make sure you have an assortment of wrenches or socket set too.
Just installed my curt I picked up off CL two days ago by myself. All you need is a bucket and some spare wood to hold it in place while you bolt it down. Took 15 minutes and I'm not mechanically inclined. Don't forget to torque it to spec btw.
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