Having just done this
-I would start in the morning.
-If you have an auto make sure that you have the proper adapters for the transmission cooling lines if you don't already. Also have something to plug the lines when you disconnect them.
-Make sure you have hose clamp pliers
-Having done it now it was pretty easy. It seemed a little intimidating at the time for some reason. But the only thing i've done before this was change my own oil
The shop here in town would have charged 160. I would definitely give it a go yourself. You can get it done on your own
here's the link I followed Jeep TJ - Metal 3 Core Radiator Installation