HLP! Sub State Machine Animator for L and R Player animations - confused! 2D

Hi,

I have constructed an animator for my Player prefab where all anims come from Any State. My Player has a separate animation for Left and Right for every anim. I have been told my animator is cause for concern and that I should use SUb State Machines for Idle, Walk, etc but I am so confused even after reading the Docs.

Can anyone get me going and showcase how Idle SubState Machine works in the base layer and within the Sub State? I use FacingRight as my Bool Animation Parameter for L or R.

My current animator:
https://www.dropbox.com/s/2op8f7j79hkcl3n/My Animator....png?dl=0

My attempts at sub state machine:

https://www.dropbox.com/s/eouohdnqlqzh7j2/Idle SubStateMachine confusion.png?dl=0

https://www.dropbox.com/s/usl9jbur6ffyfau/Idle SubStateMachine confusion1.png?dl=0

Thanks guys!

James