You don't want to overthink anything. Because then you'll miss out on the small little details. Those small things will help you see the picture how it's supposed to be. We tend to overthink relationships with others and situations that are small. We like to put a lot of thought into things that don’t simply need any. Just be and accept what is. You can think things through, but do not over analyze it.
Lately, I haven’t gone to the extreme of overthinking. To say it don’t happen would be a lie. I just know when I did, it didn't make the situation better, perhaps worse. Being patient with what is and not focusing on the end result because it is what it is. What’s going to happen will, and why overthink situations where you have no control. Be comfortable with everything that happens in life, just know it’ll be okay.
How to not overthink, just be, and meditate. Free your mind and everything will follow.