The hardest part can often be generating your own source of positive feedback when you're not getting it from the outside world or from even those around you. It's very easy to be positive when you're drowning in investors and champagne, but not when you've been told "no" again or when the setback you've encountered forces you to realize that you've lied to yourself and you knew all along with you should have been doing but you weren't doing.
Imagining my goal as inevitable, as something that's already happened helps me stay positive. Anytime I encounter negativity that isn't productive I consider it just a delay in a waste of my time.
Reappraisal is also a very powerful skill for remaining positive. If you stop looking at your mistakes as setbacks or even mistakes and simply as "cost paid for acquired wisdom" you'll realize that your value has still increased because you are now wiser.
