Anybody out there who has never made a mistake thinking something would work and it didn't?  Not me, that's for sure.  We learn by doing, by making mistakes.  We learn what works and what does not.

We might say, we exercised bad judgment when we tried something that didn't work. 

If we are smart and successful, we learn what works and what doesn't work, focusing on those things that work.

Go ahead, try something new.  Make some mistakes.  Exercise a little bad judgment.  Just learn from them.  

Jim