There are a few simple steps to do.
Remove 2 fuses, clearly have the weight off the strut (Well you need that to take the strut off!) and open the bleed nipple on the pipe to remove any pressure.
Then its just a case of undoing the nut on the old ball joint, the 3 on the top of the strut, the sensor on the top of the strut, then the fun starts....
Break the ball joint free, you cant get a clean hit on it due to the tie rod, and you can't fit a puller on it, its the old fashioned hit it method on the nut until it comes off.
Clean the area around the "Quick release valve" and remove. Mine would not come off at all so was unscrewed from the manifold.
Even the Merc garage was unable to remove it and said it would be fine to put back on as is. (no leaks we tested it quite a lot)
Then just refit. Normal issue trying to tighten up a new ball joint, in that the joint will turn before you get enough "bite" on the cone to overcome it.
To sort out the air you just raise and lower the car 10-20 times and it self bleeds. Hardest bit so far is finding a Merc dealer with any ABC fluid so I can top it back up, You only lose a small amount of fluid.
If anyone has any and is going to Castle Combe I would be grateful of a few drops!!
All in All not too bad and its a heavy duty replacement with warrenty.