There was a thread on this within the last 6 months or so. I put a link to a good tutorial.
As above, the full rebuild is not particularly hard, but it takes a while and you can find yourself redoing large sections if you forget a piece / compress the post at the wrong moment. I did three posts in the same session; the first took over an hour, the last one took 10 minutes once I knew what I was doing. I’d say it’s pretty doable for people who like tinkering with suspension forks.
You’ll need an IFP tool, some suspension grease and oils in addition to (mostly) standard tools and a vice. I’d also recommend replacing the IFP and its O-rings (the reason they develop squish is because those components are worn).
That said, my current post was under warranty (and I had a spare), so I sent it back rather than doing it myself.