'Yeah, I'm also baffled at your thinking of "I'll leave it all to chance, I'll face it with a grin" as an ongoing action. It's not like you'll be doing whatever it is you're going to do all along waiting for it happen.'

I think this may be just my personal interpretation of the song. To me, 'I'll leave it all to chance, I'll face it with a grin' would be metaphors for an ongoing attitude, a state of mind.

But I think your idea of it being 'do that once when the time is due and be done with that' is equally, if not more valid, in that it suggests only taking that attitude when necessary.

It maybe depends on whether you take the meaning of the song to be about a constant struggle, or lots of discrete struggles puncuated with periods of peace. Being a pessimist, maybe I choose to see life as a constant struggle, whereas you Russians don't...