Did mine after a few weeks riding, takes less than 30 mins for a quick oil change and is definitely not worth the £65 windwave charge.
It’s worth doing as the oil levels in mine were way down on the recommended levels from the marz website.
If your only doing the oil change you can just remove the top caps/spring leave upside down to drain the oil, you’ll need to cycle the suspension through its travel a few times to drain the oil from the cartridges, then refill with the correct amounts (I changed to 10wt, seems to work better, for me at least) and job done.
If you want to lube seals and get rid of that rubbish foam wiper then seperating the forks is no big deal, just drain as above and remove the foot nuts and then seperate, at this point you’ll realise just how simple the forks are and start wondering why they cost what they do.
Mine came without a foam wiper, so would have saved me the bother of taking the forks apart if I’d known.
Putting them back together is a bit of a ball ache as the foot nut on the cartridge side just spins the cartridge when you tighten it, I managed to get it to tighten due to the friction between the bottom of the cart and the the fork lower, being delicate is the key.
Anyhow, did this around 2 months ago and after being hammered around the forks are still super smooth, just like my old 2007 66’s