That is sometimes the biggest problem is doubt and uncertainty. When you set yourself a big goal, then where does your confidence come from. That’s a big question. Some people are designed to “never lay down in the dirt” and won’t ever give up, but that is not everybody. So, this a great opportunity to really develop your own self confidence.
You have nothing to fear but fear itself.
Franklin Delano Roosevelt, First Inaugural Address, 4 March 1933t

It sure is hard when you see the making it to the top of the hill, but sometimes it’s all in the mind.