It is a major PIA in my experience. I would suggest getting a spare of all of the plastic clips that you will be removing. They are a pain to get to and can be brittle with age. I have done this exact install twice and done the removal 3 times. I used a very long zip tie threaded through the connector when I was reinstalling. I did not "connect" the zip tie. I just threaded it through and let the fat end retain it. This allowed it to be out of the way as I put the assembly in and then pull the zip tie to fish it back up to where I could grab it. A good amount of patience and extra time are good also. I walked away a few times.
As far as special tools, the only one listed in the procedure is Fuel Tank Sender Unit Wrench 310-123. There are multiple brands available on Amazon. At only $20, I would suggest it. It is worth it in time and not damaging the lock ring.
I am extremely happy with part now that it is installed. No drive-ability issues at all. The stock system seemed to handle it just fine and now that I am tuned, it is working well also.
