Difficulty level to swap out a radiator?

I'd say between a four and a six. You may have additional things such as AC lines going into it, as well as transmission lines. If you are comfortable working on cars, its not a horrible job. The best advice I can give is to go to a garage and ask them to empty your AC lines so you don't release puron into the atmosphere. Also, and I'm not trying to be kinky with this, pick up some unlubricated condoms and some zip ties. Put these on the lines going to and from the transmission to minimize fluid leak from your tranny, and to keep from having a bigger red sticky mess to go along with your green sticky mess. Due to the fact that you may have fluid loss with the transmission, don't forget to check the fluid level to prevent from having slippage the first time you take the car out for a spin after you get it fixed.