Set reasonably attainable goals, then once you've accomplished it set a new reasonably attainable goal.
Frequently reassess whether the goal you originally set is still actually the goal you most want to be pursuing. Sometimes you set a goal and at some point later realize it isn't worth it or will never actually succeed, in which case you're much better off abandoning that goal so you can instead pursue a goal that will actually succeed.
Aim for the Moon.
At least if you miss, you'll end up among the stars, floating to the infinite without any chance of rescue, counting the hours for the oxygen to run out, wondering if it's better to just open the airlock, joining the void in an empty embrace.
Aim for the Moon.
At least if you miss, you’ll end up among the stars
Well, if you mess up a trans-lunar injection, you'll still be in orbit around the Earth. You'll still be able to see the Sun quite well, but I'm not sure if that counts as "among the stars".