Shimano Ultegra 6800 Rear derailleur: how to Service Overhaul clean dissembled

How to dissemble and service a 11 speed Ultegra rear derailleur. Interesting updates in this one. Hollow pulley wheels, Barrel adjuster.
I've got more bike parts than bikes! This channel gives me a reason to buy another bike part and to keep working on bikes. "Une raison d'etre" if you will.
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Love bikes, components aswell as the history of cycling. Specifically 1980's and 1990's MTB's. Something about the adventure, using a 2 wheeled device that allows you to freely go where you want, was my attraction to cycling.