This is hard work, but if not done rationally may leave the design with fatal flaws. Such a process creates designs that are difficult or impossible to better, which is the objective of a good designer. Seek and listen humbly to comments from anyone who will listen. By explaining your ideas and listening to comments, you clarify them. A difficulty many engineers have is to listen humbly, particularly to an outsider.
Arrogance is disastrous to a good design.
A good designer must be humble, an attribute that is rare. Seek advice from the best experts available in every specialty area. It should be obvious that none of us can know the details of every engineering specialty, yet there is often an innate desire to try to develop a design ourselves. The best design will take advantage of the best information available. A large portion of an engineer's work is to obtain such information.