Installing is pretty much as simple as it gets. Just install the new seat and seal- seal first into the shifter socket. No special tools required. Next install the new shifter cap by popping off the old, pressing on the new. Apply a thin layer of general purpose grease on all components.
Now reverse the disassembly instructions and wallah- all done. Happy to say that the truck now shifts and drives better than it did even when new. The grand total cost was $20 and 30 minutes of time, which is a lot cheaper than paying for someone else to do it or worse- having it misdiagnosed and have to buy a new or rebuilt transmission.