I call this approach "joyful negativity."  I assume most of my efforts will fail and accept that outcome.  In truth, most efforts are at least moderately successful, which expands my joy to something higher.  The times when I really do something cool or find some other reward are sheer bliss.  Set your expectations low, keep your effort on high, and you cannot help but be pleased with the results.  That's just my personal philosophy.  Sisyphus did it another way . . . .