I just replaced the bushing today, was a pain but glad it's done.
I removed the "gas" pedal (it's electronic, isn't connected to the throttle body) to get more room down there. Disconnected the ISS upper portion and slid it toward the firewall. Used the seatbelt to lock the steering wheel from spinning and potentially damaging wires. The two "lips", I inserted a flat blade screwdriver at the front of them and twisted (as seen on a YouTube video) and was able to pull it out easily.
When I got the bushing out I noticed it's the same part number as the new one I got so someone had previously replaced it (I've had the truck just over a year and it's a 2007). I also noticed the inner bushing with bearings had come out of the groove they're supposed to rest in. This was probably the cause of the groaning sound the steering made while turning. It also wasn't supporting the shaft like it was meant to do so the clunk was pretty loud and annoying. I was able to snap the inner ring with bearings back into the groove but decided to use the new bushing anyway.
After some muscling I got the new green bushing back in and reconnected the ISS to the upper shaft, bolted it back in place then put the accelerator back on. It has two 10mm bolts, upper and lower, that hold it to a metal bracket. Reconnected the wires to it then took the truck for a test drive. No more clunk, no more groaning while turning. We'll see how long it lasts. Truck has 172,000 miles.
Unlike the OP there was no trimming or clipping involved. Just insert the screwdriver and twist, it'll move the bearing housing down and then it's easy to slide off, took less than a minute. Getting the new one on involved a large screwdriver and some muscle but it finally seated. The rest was easy. Again, I watched several videos until I got what was going on. Aside from disconnecting the upper portion of the ISS I didn't do anything else to it. No regreasing, etc.