Here's what happened...
As a refresher to those who may not have seen my earlier post, we just purchased the 4Runner a week ago for $5,250 with 142k miles.
I purchased Bosch Platnum +4's to put in as replacements. We replaced the wires, cap and rotor. When we got to the driver side plugs, we found that the plugs were Denzo's and may have had 1,000 miles on them, they really looked good. We checked the gap (.004) and put them back in.
When we got to the passenger side, we pulled the back one first since it was the hardest. It was kind of hard to get out, not so bad to reach into from the front, so once it was loose (using a swivel), we took one of the old plug wire ends and cut it off the wires and reached down and pushed it on the plug so it was tight, then hand loosened it the rest of the way and was able to pull it out. We used the same technique to put it back and then swivel socket to tighten.
All in all, it went pretty good.