"At first blush". does time travel really offer a second chance to get it right the first time?

Fermi allowed for quantifiable uncertainties, and gave a cold eye of calculation to deductive miscalculations, or mistakes in perception.

Elseways, in a litany of various failings, we begin to find a kind of bruised dignity, as of the dignity of mistakes and half-scrapes, the end of which we are just happy to still be alive. 

Meanwhile the past is buried, but it is not so dead as we wish to believe.

Where are the shopping carts, you might ask, and can I time travel to back when they were all in the corral so I can better keep track of them, in lieu of a better solution?

In all this uncertainty, there is your own ruling principle, not your friends' advice, and not your horoscope.  But your own judgement, as if to say, despite it all, you know yourself better than they do, and you are far better informed to make a decision in your own best interest.

It would seem there is a kind of uncertainty in Free Will that some folks can't or won't accept because that uncertainty manifests as anxiety, but do they not see that the anxiety is born from a false narrative coming from without, and not the realization of some glorious perfect dream?

Just like the old warnings that they gave around, talking about turning off electronic devices like cellular phones and pagers, in certain places, because of a fear of electronic disruption of sensitive instruments, just like a pilot, hands on the yoke, switching off the automated system to land the plane using only his own skills, something he knows how to do.  Just like we are born with certain instincts, instincts created thousands of years ago, so we can go so far without training of any kind, because the modus is innate, inborn, with us all the while, from the beginning.

As is said from another, to fear having what you want, but to be living in the interim in the shadow of failure, and barely getting by at that, stymied, grown accustomed to having failed in the realization of the glorious dream.  To wrap one in a comfortable shell and claim to enjoy the failure, having come to embrace it as reality, where "fun is fun, and done is done".  To have learned to smile on the dismal, and be urged on by one's support system, urged on deeper into the aftermath.

As Renner was demonstrating, he keeps visiting Laodicea, and he observes each visit how more and more of the ruins are excavated, more and more pedestals, statuary, columns, set aright.  But that's not to say, "it could have been better" but to say, "I want to understand how it really was".  And that much we are saying more and more everyday.

But when to improve, and not just strengthen our forearms as we cling desperately to the cliff-face?

Remember this final thought, a bit of pun, as it were:  A friend in need, is a friend that will let you watch her pee.  And in the dismal aftermath, 10 years, 20 years on, we take our amusements in a dismal fashion to match the dismal life with its dismal rime of dust, its undercurrent of mold and dry rot.