Hope for the Best
Prepare for the worst, because complacency won't do. Because the worst can happen. Because that's how you can remain calm when you face challenges. Expect them and prepare for them. And be ready to improvise when something unexpected happens.
But look to the future with hope.
Despite the setbacks that may happen, your dream results can absolutely happen too.
In preparing for the worst, you're also working to achieve your goals. Because you're equipping your future self. You're preparing the tools necessary to get past roadblocks, and onwards.
Prepare for the worst, but hope for the best.