Having a sound resolution when making decisions is great. It is a good foundation of becoming a successful person. That said, we all need to be open to suggestions. It does not mean that we should take them all in. But we should hear them out. You might think that you know better, with all the research that you have done and the nights spent perfecting your plan, that you don’t need anyone else’s inputs. If you have already done those things, good for you. You sound really prepared, so it shouldn’t really hurt you to hear the suggestion out. Who knows, it might be of use somehow to you, if not now maybe later in the future.