Do you have the I6? You can leave the Rad in but you will have to take the shroud out Which is a PITA,
You can leave the shroud in. I just changed mine on my 2000 JGC, I6, and it was no problem.
Make sure you do a flush with the additive before you drain everything. Just add the additive directly to the rad. The additive is available from any supplier.
Also, now would be a great time to replace ALL hoses including the heater core lines. Also as a post before, replace that t-stat.
All toll, plan on about 1/2 day of work. Taking the fan clutch off is the hardest item. Just use a belt wrench and slip it over the pulley. My belt wrench kept on slipping, so I wrapped some hockey tape around the pulley, and then put the belt wrench over that. It worked perfect...
I believe a pump at napa is about $100, hoses say around $50 for all of them, t-stat $10, coolant, $20 (mix 50/50), new hose clamps (optional $5), coolant flush (for before you drain everything) $5. beer ($???)
all together I would say count on $200 to do it right. If you have some miles on your radiator and want to replace it as a level of comfort I think they are around $150. If you have mantained your system with flushes every 30K miles, then your radiator is most likely fine.