Can I self-diagnose my personal color?

I've also heard a lot about personal color.

It is being featured a lot here and there.

It's a bit embarrassing to go around asking about it...

I am curious about a simple way to self-diagnose.

Is it that one needs discernment to make an accurate diagnosis?

Once personal color is diagnosed

To what extent should it be applied appropriately?

It might look tacky if the whole outfit is coordinated.