My magic word: Nearly
Its funny. As much as I love the inflexibility of doing something everyday... it makes it much easier for me to do... it also makes it much harder for me to get up after a slip. After all, I failed.
But I add the word nearly and - magic! - I haven't failed, but I sure had better do it this time... because if I don't, then I will fail.
Nearly offers the breathing room that allows tiny, infrequent missteps to be, just that, missteps, rather than failures that doom the whole endeavor.