The difficulties are not so much is simply getting them installed. It is getting them installed and having a "gen feel" when actuating, actually using the bezel. Myself and others, including LV owners, have noticed some of the bezels become very difficult to turn. (BK has a post about it, and how to press and turn).
A non-issue if you never plan to hand your watch to someone who is a "bezel turner", or if you are not a bezel user. (I use mine regularly to time parking meters, etc, so it was a show stopper for me.) Again, depending on the 'moment in time, and WM9 parts BK has on hand YMMV...
The good thing is you are working with BK-- he is in getting or making things right.