transmission filter

Hi all, since I'm about to replace my radiator while replacing my broken water pump on my 2002 TJ, I was wondering when a complete transmission fluid flush is actually necessary. I did some reading here and the process seems not to be super simple to do at home, if I want to do a complete flush...

Working on my first transmission flush and filter change. One of the pan bolts is worn and the socket slips so I wanted to replace it before it gets worse. After scouring the internet the only part number I could find for this was here...