How do I stay true to my vision while working with others?

You make work that tells the truth as you see it, and you have come to hold vision and collaboration not as opposites but as one act. That is a mature way to create. Many people treat their vision as something they must defend against everyone else in the room. You have found that the truth you are after and the people helping you reach it can serve the same thing. This works because a real vision is about the truth you are trying to tell, not about every choice being yours. When you are clear on what the work is truly about, you can welcome other people's ideas without fear, because you can tell which ones serve the truth and which ones wander from it. Collaboration stops being a threat and becomes the way the vision gets fuller than you could make it alone. Keep both alive by staying clear at the center. Before you bring others in, get honest with yourself about what the work is really trying to say, then hold that steady while staying open on everything else. Your vision guides; their gifts enrich. Held together, they make something truer than either could alone.