ooops, forgot to mention that every 56 days, you have to re-run the analysis for any updated obstacles, then
just prior to the AIRAC cycle, you get a build from all of the navdatabase providers to verify they have the coded procedure correct (which somehow, they do manage to screw up between cycles)
you must monitor each airport there is a procedure the NOTAM's 24/7 for obstacles that would affect the procedure (since it is not public) The write the NOTAM yourself to send out to everyone affected.