Understand that the road to success will not be unending, continual joy. There will be difficulties, setbacks, and moments where you question your commitment. These will occur whether you’re on the right path or the wrong path, so understand that while it might be hard sometimes, you’ll need to make an effort to re-establish and embrace that positivity you felt at the outset of your endeavor.
A therapist once told me something that's as true now as when I first heard it: "You can only go as fast as the slowest part of you can go."