So it's not "ok to fail" this week?
It is not the failure itself which is progress, it is the act of failing, then feeling BAD, and then thinking about how not to feel BAD anymore. Failure without feedback is pointless failure. (This is the same idea than deliberate practice.)
Let's say I'm a programmer. I try an approach. It doesn't work. I realize it doesn't work and back out my changes. That's a failure.
Let's say instead I try an approach. It' doesn't work. I keep trying to force it to work, distorting the overall architecture and still leaving an unreliable, unmaintainable mess. That's a blunder.