Definitely tough to define, but in my defense that is a different question than you initially asked.

Kind of like the old "I know it when I see it" (or at least I hope I do because I need to know it to do it)

I will say that if you are starting from a rules model instead of a virtues model, you aren't there. That means if you think you can ever be done while alive, you are wrong.

From experience I think there are a lot of dichotomies in the actual virtues required. One example... I think you need the will and social control to bend the world to your own will because you know you are right and you won't compromise your values. You also need the ability to let go of self completely and do other peoples plans with full dedication. Because those things are opposed concepts you need discernment to know which to apply in the situation you face right now and the character to do it.

We all know a man who we think less of because he is just a stubborn prick. We all know a man we think less of because he is a complete pushover.

You have to thread needles constantly like that. Each one you face may be within your existing skills or may require personal growth. Each time growth is required you may "git gud" or fail.

One I'm sure of is actions matter more than words. A man who is always talking about how manly he is probably isn't that manly.

I'll add I don't think that the virtues that matter to manhood are exclusive to men. Virtues are universal. Those same virtues are required for womanhood. The difference shows up in the application. Sexual dimorphism and social constructs put women in different situations with different constraints to how they can and should apply each virtue.