Thanks to KMan for the excellent write-up I was able to do this today. I am a novice so it took me a while. Here are some notes:

Unbolting the exhaust hangar mount in the middle of the heat shield is necessary, and the trick I found was to spray a bit of silicone lubricate where the hangar pokes through the mount, then use towel or something with a bit of grip to pull it away from the car towards the outside and it will slide/pop off easily.

Use gloves (as always) but especially when working with the heat shield, as there are a few sharp edges.

When remounting the new mount, I used the 4 1/4 inch (smaller of the two) pegged semi-circular pieces from the kit into the "front" (back end of car) of the mount and the 3 3/4 inch "larger" rimmed circular piece from the kit on those other side (front end of car). If you follow KMan's writeup, the usage of the tool is actually pretty simple.

One word of caution, is as you are removing the mount using the tool, it's possible that it is really wedged in there good, and the rubber can begin to stretch more than the mount will come out. Towards the end of the limit of the special tool, I could see the rubber exiting the hole without us turning the bolt, so I knew there would be some recoil incoming. Just be careful at this stage, because it can shoot right out if you aren't prepared. Just make sure to watch the rubber in the hole as you are screwing and you can see how much tension load you are putting on it.

I also replaced the other parts shown in the parts diagram, such as the rubber stopper and the long bolt with nut - just for good measure.

Of course, my vibration at idle is still present. In P it is diminished, and in N it goes away for the most part. The real test will be when we get it to higher elevation and see if we still have the acceleration wobble (never happens around town at lower elevations, no matter what the speed or amount of acceleration).

Once again, thanks KMan for great DIY.