Leitz- I have been swapping out my vintage MBW 2836's with 2846's, as they beat at a slower 21600bph, which is closer to a Rolex 1570's 19800bph. This swap may be temporary as I have some AS movements that will work with the pair of genuine 1570 datewheels that I have, but for now I have these slow beaters installed in my 1665, 1680, and 7298.
Getting the dates to line up in the window is an exercise of trial and error. Because I have to reinstall the datewheel overlay onto the 2846, getting it aligned correctly is a bit time consuming. Factor in the installation of the floating Singer dial, and you've got another item that must line up correctly as well.
Ludo- Go slow and take your time! For me, mistakes typically happend when I try to rush something, so just relax, and take deep breaths
In all seriousness- I've found that a razor blade helps slice the glue and allows the dial to come off easier. Just go around the diameter, and you should be good. Just be sure to clean the old glue off!
For dust on the dial, I recommend a dust blower. A couple of puffs will take care of any dust particles on the dial or on the underside of the crystal.