Just an update:
I did the repair as planned/outlined above. Nothing came crashing down or slammed/smashed me. In fact it was all rather uneventful. I didn't have to remove the shock, tie rod, spring, or even the tire:
1.) I drove the truck up onto four (4) car ramps, to raise it up, and keep it all level
2.) I unbolted/removed the mudflap, and removed the lower most "christmas tree" clip holding the inner fender liner. I then drilled a small hole in the plastic liner, just big enough for the hook of a bungie cord. I then used the bungie cord to pull/hold the bottom of the fender liner forward and out of the way.
3.)Next, I used a grinder to shorten the body mount bolt an inch or so. I did this so the body of my angle grinder would not rub on the bolt when grinding the rear rivet for radius arm bracket.
4.) I removed the nut on the back of the radius arm (holding the bushings,etc..) (1-1/4" wrench)
5.) I ground off/punched out both rivets.
6.) I removed the 4 bolts holding the 2 radius arm brackets together, in the center of the truck. I then removed the remaining 2 bolts.
7.) At this point the radius arm is "free". No disaster occurred. Since I was only doing the passenger side, and the passenger side sits on top of the drivers side bracket (n the middle), some prying and wiggling were needed. Also, the cat does get in the way. Unbolting prior to beginning would make things simpler, but I didn't want to bother. I also didn't want to risk opening a can of worms, by disturbing more stuff. With some strategic prying, pushing, and pulling, you can "sneak" the bushings, and then the bracket, off the back of the radius arm, and around the cat. It may be helpful to wedge a block of wood or something between the RA and the frame, as it will tend to rotate up towards the frame, when disconnected. Also, to make it easier to reinstall the new parts, I put a floor jack under the driver side axle beam, and jacked it up just enough to put weight on the jack (really just barely). I then used a small ratchet strap, with one end around the cross bar of the jacket (for the "axle"), and the other wrapped around the RA. I used this to pull the end of the RA down and "in" (towards the center of the truck). Not a lot..., but just enough to make it easier to get everything around the cat.
8.) Get everything in place, and reinstall all your bolts,etc.. I used a new radius arm bracket, which came with all new hardware. Also, after placing all the bolts in there holes, I tightened the center bolts first, then the bracket-to-frame bolts, and finally the RA end nut.
Of course, if you're doing the driver's side, you'll have to deal with fuel filter as well.
