In order to accomplish great things, one must not focus on the totality of the entire project for that tends to lead to overwhelment and doubt. Instead, focus on the next step and set about to accomplish that. The following day, focus on the very next step and that is all.
Eventually you will look back and see a long path of steps behind you as you admire your goal in front of you! It won’t seem nearly so overwhelming then for you will have attained it, one step at a time.