How obvious do I need to be for a guy to know I like him?

Honestly, this is just an ask for in general since I hear guys don't know when girls like them. I feel like with my personality it's easy to tell I like a guy cause I either just stare at them all the time orrrrrr am extremely shy despite my extroverted behavior.

I want a husband eventually so if I like a guy and have to make a move, I'm just wondering how much it takes for a guy to finally realize I like them? With and without me saying it.

How obvious do I need to be for a guy to know I like him?
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