There is no other option. There is no plan B. Make one hell of a plan A and execute to your fullest ability. Do not give yourself excuses or alternatives. If you have a vision then you should be 100% committed to getting the job done.
Be prepared for challenges and obstacles and have a plan to get through them. These are minor compared to how major you accomplishing your dreams. You will either succeed or learn. There is no failure. There is also no success unless you take shots. The more shots you take the more opportunities you will have. In baseball if you get a hit 1 out of 3 times you have a great chance to end up in the hall of fame.
Keep your head high and keep swinging the bat.