Here is how I did it with the 190E but with the W126 you will have to detach the hub from disk brake by removing the bolts from the inside. The best way to do that is to put back the hub & disk assembly back in the wheel (away from the car of course) then attempt to remove the bolts. This way you have a larger surface to hold on to while you use leverage to get the bolts out.

This here can help in terms of the bearings but the hub is not set up the same as the W126
http://s713.photobucket.com/albums/ww134/drewprof/190E_Front_Bearings/?albumview=grid