I've got the heater core blues, too. Will be picking one up from Rock Auto and doing the swap soon. A friend of mine had to do one on his WJ a couple of years ago, so hopefully it will not be too bad.
I bypassed the heater core for now (5/8ths heater hose from O'Reilly, oem clamps), which was not too difficult, other than having largish hands and trying to get my mitts down to the water pump.
I figure an electric screw driver, some baggies and a sharpie will help with the job. Of course it goes out in the middle of winter, which has been mild until now, a string of 20 degree mornings.
Been lurking for a while. I like this forum. Lots of good people and info, no drama or flamewars. Glad to be a part of it now.