If you've done something before, you can do something again.

Take a moment to look back in time and think of things you've done so far.
What's one thing you're most proud of?
What made it so important to you?
How did you do it?
What did you feel the moment you knew you've done it?
What particular skill was key to the success?
What could you do now with that skill?
What is stopping you now from doing it?
What would you feel if you could just do it?

The past created the present. The present creates the future. Success is using what you've got to get what you want. If you've done something before, you can do something again.