Gratitude that you've made it this far and that your dream is coming to fruition is important. I believe in being grateful before I actually receive my blessings. That's how I activate my faith. And I find that the more grateful I am, the less I focus on obstacles. I don't ignore them, but I keep them in the proper perspective. And while I'm not happy about them, I try to be grateful for the obstacles knowing they serve a purpose.
Confidence in your plan, hard work, and abilities will help. Remember that you're already a winner. Many think about doing something . . . you actually did it. That itself is to be celebrated.
Finally, perseverance is important at this point. You didn't come this far to give up now. As for how long you should persevere, only you can determine what works best for you. I like these quotes: 1) from Josh Billings: "Consider the postage stamp; its usefulness consists in the ability to stick to one thing until it gets there"; and 2) from Jim Rohn: "Some people plant in the spring and leave in the summer. If you're signed up for a season, see it through. You don't have to stay forever, but at least stay until you see it through."