I personally would not reccomend doing the service yourself. Its really messy and you need a very CLEAN place to do it. Dust and debris and dirt are not helpful to your transmission. Additionally the 722.6 requires a special dipstick tool and is tempature critical and requires and infared themometer in order to check the tempature of the transmission. Having it done at the dealer and doing it yourself works out to be about the same if you have to buy all the tools needed.

I do a lot of DIY work but I draw the line at certain messy and difficult jobs.