So you do it anyway! The less sure you are that you can do this, the more important it is to do it now: you are more likely to remember the change that was made (and that person is more like to be around)

30 years ago mainframe companies started realizing that their mainframes couldn't restart anymore - after many years of uptime all the on the fly configuration changes wouldn't be reapplied and so the whole couldn't restart. (all hardware had redundancies and backup power supplies, so any individual component could be replaced and most had been over time) So they started scheduling twice a year restarts to test that the whole could come back up. The mainframe itself is fully able to run for years without the restart, but the configuration wasn't.