A major truth about diagrams, especially a well detailed diagram is that a single mistake in one part can make the whole work entirely wrong. It requires a careful study and practice.
Imagine drawing a diagram almost near the end only to discover that it is a wrong Diagram you've been working on, it is quite painful. All the time spent, the efforts and intelligence pit into it is all a waste.
Which is why it is advisable to always do diagram with caution and enough carefulness, and always check at a certain interval if it is still on track. With this in mind, you would certainly make a very good diagram with a lesser chance of error making.
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